i only heard that the wifi-code part has issues...don't know which line or anything...but only with esp32..i also had those "flashes" in a previous version when i changed the brightness but not anymore....so definitely a software problem...
i have some china d1 minis...works great....
I've tried with an ESP8266 (china clone) and it was even worse lol
Well I guess I'll wait for the D1 mini to arrive and see what happens.