Why does Zyxel Keenetic heat up?

Question

Iron

This device, the first generation. It began to freeze, the WI-FI signal disappeared for a few seconds. Pings are jumping. Frequent connection disconnects. Disassembled it. Instead of a heatsink, a flat plate is glued on the chip. Don't hold your finger for long.
Capacitors are not swollen. The power supply did not open, it is either on latches or on glue, it has not yet begun to spoil.
It does not depend on the firmware. Tried several versions of both the first and second firmware.
In the summer in the heat worked without interruption.
It is checked up with two providers - the first on IPoE, the second through normal NAT. Turned off hardware NAT in the router - did not help. Already ordered a small cooler, but this is only a treatment for the symptoms.
There is a multimeter. I will be glad to any versions.

Answer 1

It was so. I didn’t bother and changed to a new Keenetic