Gold Stereo - Disturbed Stereo Image - One louder than the other?

[Snoopy8]

I have 2 L series Golds, recently upgraded to DOS 2.10 from DOS1. They have always been warm and I did not notice a difference between DOS1 and DOS2.

My stereo image is now dead center. In DOS1, I was noticing a slight drift in the stereo image to the left over time and this could be corrected by resetting the setup.

Hopefully, Devialet Support can resolve your problem soon...