Strange buzz from side rearview mirror

Hi,

I have replaced OEM electrical right side rearview mirror with aftermarket one maybe a year ago. Old side mirror was small one and had a faulty mirror heater. It was throwing a fault code on VCDS when I turn side mirror heaters on (on right side). Also, it was a bit stuck from time to time when I was trying to adjust it remotely (maybe from age and dirt inside the motor).

Accidentally, few weeks ago I’ve find out there is a strange electrical buzz coming from the new aftermarket mirror when I open the doors (any 4 of them) and also when I open the trunk (doors closed). Buzzing stops when interior light comes off. There is no VCDS codes on electrical circuits or any kind of error at all on this car.

Also, maybe it’s good to point out that I had some problems with comfort module and interior lights in the past (bad motherboard joints). I’ve re-solder the module and all was good and in working order and it still is.

Does anyone know what may be the issue here before I start experimenting with new module or rearview mirror…which I have to buy first, and I would like not to, if it’s possible?

Thx..