Hi

My Fireface suddenly shuts down, loses power. Then i switch the on/off button to 0 (off) and after 5 minutes i hear a thumb in my speakers (active ones, still on power). After that i turn on the Fireface and it works for about an hour and the same thing happens again.
It's not overheating, when i put my hand on it, it is not hot, not even warm. I replaced power cable and usb cable, tried connecting it with Thunderbolt, same thing.
There are ni electrical issues in my studio since everything else works normal

Any ideas what could be wrong?

Thanks

Drago