TP-Link router keeps disconnecting? Actual fixes that will work.

TP-Link router keeps disconnecting, and in most cases the fix is one of five things: the router is overheating in an enclosed space, your ISP connection is dropping and the router is getting blamed for it, the Wi-Fi channel is congested because you live in an apartment building with dozens of neighboring networks, the firmware has a known bug that a pending update fixes, or the power supply is unstable. We see all five regularly in support queries, and the order above roughly matches how often each one turns out to be the cause.

Before you try anything else, do this: restart the router by unplugging the power adapter from the wall (not just toggling the switch on the back), wait 30 seconds, and plug it back in.

If the disconnections stop for a few hours and then return, the problem is likely thermal or firmware-related. 

If the disconnections persist immediately after restart, it's more likely an ISP-side issue or a hardware problem. That distinction saves you from troubleshooting the wrong thing.

Is your router overheating?

This is the most under-diagnosed cause of random disconnections in India, and it's the first thing we ask about when customers report intermittent drops.

TP-Link routers have passive cooling, meaning they use ventilation slots on the casing instead of fans. When placed inside a closed TV cabinet, stacked under a set-top box, pushed against a wall with the vents blocked, or left in direct sunlight near a window, the internal temperature rises until the processor throttles performance or the router reboots itself to prevent hardware damage. 

You won't see an error message. The Wi-Fi just drops, comes back after a minute or two, and drops again.

How to check: touch the underside of the router during a disconnection. If it's uncomfortably hot to hold, heat is likely the problem. TP-Link doesn't publish a specific operating temperature warning on most consumer models, but the spec sheet for models like the Archer AX23 lists operating temperature as 0 to 40 degrees Celsius. Indian summers routinely push indoor temperatures above 35 degrees in rooms without AC, and an enclosed cabinet adds another 5 to 10 degrees on top of ambient.

Fix: move the router to an open shelf with airflow on all sides. Keep it away from other heat-generating devices (set-top boxes, gaming consoles, NAS drives). Orient it upright if the stand allows it, since the vent slots are usually designed for vertical airflow. This alone resolves the issue for roughly a third of the disconnection complaints we handle. No settings change needed.

Is your ISP connection dropping, not your Wi-Fi?

There are two separate connections involved: the Wi-Fi link between your device and the router, and the WAN connection between the router and your ISP. When "the internet goes out," either one could be failing, and the fix is completely different depending on which one it is.

How to tell: when the disconnection happens, check whether your phone or laptop is still connected to the Wi-Fi network (the Wi-Fi icon is still showing; you can access the router's admin page at 192.168.0.1), but you can't load any websites. If that's the case, your Wi-Fi is fine. The ISP connection dropped.

Common causes of ISP-side drops in India:

Your ISP uses PPPoE authentication (common with Airtel Xstream and BSNL) and the session is timing out. Log into the router admin panel, go to Network > WAN, and check if the connection type is PPPoE. If it is, check whether the "Secondary Connection" is set to Dynamic IP rather than disabled. Also ensure the "Connect Automatically" option is enabled so the router re-authenticates without manual intervention after a drop.

Your ISP's DHCP lease is expiring and the router isn't renewing it fast enough. This shows up as brief 30 to 60 second outages at regular intervals (every few hours). Setting a static DNS (like Google's 8.8.8.8 and 8.8.4.4, or Cloudflare's 1.1.1.1) under DHCP settings sometimes helps because it removes DNS resolution as a variable, even if it doesn't fix the lease issue directly.

The ISP's ONT or modem is the actual point of failure. If you can, connect a laptop directly to the ONT with an Ethernet cable and bypass the router entirely. If the connection still drops, the problem is upstream of your router, and you need to call your ISP, not troubleshoot your TP-Link router.

Are you on a congested Wi-Fi channel?

In a typical Indian apartment building, your router's 2.4 GHz radio competes with 20, 30, sometimes 40 or more neighboring routers, Bluetooth devices, baby monitors, and microwave ovens. All of these share the same frequency range. If your router and three of your neighbors' routers are all broadcasting on channel 6, the interference causes packet loss, retransmissions, and what feels like random disconnections.

How to check: download a free Wi-Fi analyzer app (WiFi Analyzer on Android is straightforward) and look at which channels are most crowded. On the 2.4 GHz band, only channels 1, 6, and 11 are non-overlapping, so pick whichever of those three has the fewest competing networks.

On the 5 GHz band, congestion is usually less severe because 5 GHz has more available channels and shorter range (so fewer neighbors reach you). If your devices support 5 GHz, connecting to the 5 GHz SSID often resolves disconnection issues that only happen on 2.4 GHz.

To change your channel: log into the router admin panel, go to Wireless > Wireless Settings (or Advanced > Wireless), and change the channel from "Auto" to a specific number. Auto mode is supposed to pick the best channel, but on many TP-Link models it doesn't re-evaluate frequently enough in congested environments. Setting it manually and checking every few months again is more reliable in dense apartment buildings.

Is there a firmware bug causing this?

TP-Link routers occasionally ship with firmware versions that have known stability issues, and newer firmware fixes them. This is not unusual for any router brand, but it matters because many people set up their router once and never update the firmware.

How to check: log into your router's admin panel, go to Advanced > System Tools > Firmware Upgrade. The page will show your current firmware version and, on most recent models, a "Check for Updates" button. If an update is available, install it. TP-Link's release notes sometimes explicitly mention "improved wireless stability" or "fixed WAN connection dropping" in the changelog, which tells you whether the update is relevant to your problem.

We've seen specific firmware versions on the Archer C6, AX10, and AX23 that caused intermittent disconnections and were fixed in subsequent updates. We're not listing specific firmware version numbers here because they change and we don't want outdated version numbers floating around as advice, but the pattern is consistent: if you're on older firmware, update first and test for a few days before changing any other settings.

Is the power supply causing reboots?

Voltage fluctuations are a real and often overlooked cause of router disconnections in India. TP-Link routers use external power adapters (the small brick on the power cable), and these adapters are rated for a specific input voltage range. Indian power supply is nominally 230V but can fluctuate, especially during peak demand hours or in areas with unreliable grid infrastructure. When the voltage dips or spikes, the adapter may momentarily lose output, causing the router to reboot.

You'll know this is happening if the router's LEDs all turn off briefly and then come back on during a "disconnection." That's a reboot, not a wireless issue.

Fix: plug the router into a decent surge protector or UPS (uninterruptible power supply). Don't use cheap extension boards with loose sockets or thin wiring. If you're in an area with frequent power cuts, a small UPS (even a basic one meant for routers and ONTs, available for Rs 1,500 to 3,000) keeps the router and your ISP's ONT running through brief outages and protects against voltage spikes.

Also check the power adapter itself. Over time, the adapter cable can develop micro-fractures from being bent or stepped on, causing intermittent power loss. If the adapter feels unusually hot or the power cable is damaged, replace it with an official TP-Link adapter rather than a generic third-party one. Mismatched voltage or amperage from a non-original adapter can cause erratic behavior that's very hard to diagnose.

Could it be a device limit or NAT table overflow?

Every router has a limit on how many simultaneous connections it can track. This isn't the number of devices connected to Wi-Fi, it's the number of active connections (each browser tab, each app, each background sync counts as one or more connections). Budget TP-Link routers typically handle 10,000 to 15,000 concurrent NAT sessions, which sounds like a lot but can be reached quickly if someone on the network is using a torrent client (which opens hundreds of connections simultaneously) or if multiple smart home devices are polling cloud servers constantly.

When the NAT table fills up, the router struggles to process new connections. It doesn't crash cleanly. Instead, some devices lose internet access, web pages load partially, and it looks like random disconnection.

Fix: if you run torrent software, limit the maximum number of connections in its settings (100 to 200 is usually enough). If you have many IoT devices (smart bulbs, plugs, cameras), check whether they can be configured to poll less frequently. Restarting the router clears the NAT table, which is why the classic "turn it off and on again" temporarily fixes this particular issue.

When is it likely a hardware problem?

If you've worked through everything above and the disconnections persist, the router itself may be failing. Capacitors degrade over time, especially in hot environments. Power surges can damage internal components without any external sign. If your router is more than three or four years old and has been running continuously in Indian ambient temperatures, component degradation is a real possibility.

Signs that point to hardware failure rather than configuration: disconnections happen regardless of how many devices are connected (even with just one), the router reboots itself even on a clean UPS with stable power, the WAN light flickers or stays off when the Ethernet cable is firmly connected, or the router stops broadcasting Wi-Fi entirely during disconnection events rather than maintaining the SSID.

If the router is within warranty, contact TP-Link India support at their toll-free number (1800 2094 168) for RMA. If it's out of warranty, replacing it is usually more practical than attempting repair, especially given how affordable current TP-Link models are.