I am new to the Pixel 2 - so, I hope I am not missing something obvious for this device (took me e. g. a little while til I understood that the Active Edge is a feature - not a bug

).
I have two devices where I seem to run into an issue with low volume also described in a
Google Pixel Help Community post and maybe
here in another thread. Initially, one of the two devices (running /e/OS S dev based on LOS 19.1) had for all sounds (general, ring ton, alarm - not tested for call) significantly low volume. Maximum would be roughly around 50 % of regular volume when putting the two devices next to each other. I thought first it is a bug of /e/OS and flashed LOS 19.1 but situation unchanged. After powering off both devices for 1-2 h, they are at the same volume level - and I would dare to say both are low.
While there is a good chance that it is a hardware issue, the
first referenced post indicates that some users experience this change after upgrading/updating their device. So, I still see the chance it could be a software bug but couldn´t find any information in the Pixel 2 ROM forum or beyond. Also, it would be a pretty unlikely coincedence that it happens to the second device right while I am testing it ...
So, anybody a clue or some information?
Just in case of any relevance:
- Both LOS 19.1 installations without GApps and Magisk - plain LOS 19.1.
- LOS 19.1 and /e/OS with their respective recovery - not using TWRP.
- Both devices IMEI starting with 35 - I found some (vague) hints that there might be a different generation Pixel 2 with another IMEI format.