Comment 2 for bug 1644721

It seems this issue is reoccuring these days.

I am using RPI 3B+, Raspbian GNU/Linux 11 (bullseye) and WiFi connection gets lost after a few hours. There are several similar reports on FB groups about it and several posts associate the WiFi connection loss to power issues.

It is really interesting that the official power supply for teh RPi 3B+ does not fix the undervoltage issue.