.Thank you all, but as I wrote - same behavior with the official RPi 3A SMPS.
It is weird, but i will try to dig deeper and if will find a solution (or reason why this is happening), I will publicate results and maybe this will help to someone (for now i found only this : https://forums.raspberrypi.com/viewtopic.php?t=290853 ).
It is weird, but i will try to dig deeper and if will find a solution (or reason why this is happening), I will publicate results and maybe this will help to someone (for now i found only this : https://forums.raspberrypi.com/viewtopic.php?t=290853 ).