Follow-Up
Left channel lost volume and got crackly after 2 hours of CD playing again . . . hadn’t done that for at least 4 months
This time, DUH, I switched to Unbal 2 input and listened to Spotify through my Mc MB50 streamer and No problems.
So, unplugged both ends of my AQ 1m interconnect and cleaned and dusted it and replugged it . . problem appears solved.
Also (mind games) but left channel seems louder and cleaner now?
Would not have thought that leaving this ic plugged in for nearly 4 years could cause this problem. And why only left channel?
Anyway, will update if problem returns again. Wtf, over !