The wifi access point is falling (router TL-WR740N). How to fix?

Question

WiFi

The TL-WR740N router is connected to a computer and distributes wifi, to which a laptop and sometimes a tablet are connected. Today there was a problem - the access point simply disappeared, but there was still Internet on the computer connected via cable. I updated the firmware, set it up again - the same trouble, a dot appears for a couple of minutes and disappears (I checked both on the laptop and on the tablet and on the phone), through the cable it still continues to work without problems.
PS She appears again in a couple of minutes, but also, for a while, and goes into oblivion.
PSS I don’t know if it makes sense to post the configuration, but still ..
laptop: Asus x550vb, win 8.1 x64
BB: Athlon 5600+, 4gb, win 8.1 x64

Answer 1

Overheat. Disassemble, put it without a case in a ventilated place, if it stops disappearing, we glue the heatsink onto the chip and rejoice.

Answer 2

Try changing the firmware to a non-original one.
For example on openwrt.
wiki.openwrt.org/toh/tp-link/tl-wr740n

Answer 3

There was such a moment with the TP-Link 741ND model. The problem manifested itself in a spontaneous decrease in signal strength (drawdowns). You can see this effect by installing the WiFi Analyzer program on your phone, or INSSIDer on your computer. The point here is not overheating and not in the firmware, apparently a tear at the manufacturing stage (unsuccessful batch).