Hi @all
few weeks ago I checked this site and downloaded the last firmware for my Adi2 pro AE: 1.80

Listening to the the music sometimes a new noise appeared ... from the left side, just a beep shorter than a second, 3..4 times a day/evening

Since 4 days the Adi2 is downgraded to the previous firmware (1.77) and no noise was detected since that change.

The PC with Intel i5 6500 skylake runs Linux Fedora 25 on a Mini-ITX board from ASRock
16GB RAM and just few programs without heavy load ....
All tunes are saved as FLAC and played with audacious
LPs are recorded with 24/192 and CDs from HDD as it

Just for information