I’ve had this happen and eventually traced it down to Class D amps being off all weekend. They took about 48 hours or more to warm up. Others have had similar experiences. Not sure if it's all amps, or just ICEpower, but mine for sure.
Mood
Last night, listening before I went to bed, I was convinced there was something radically wrong with my system. Nothing sounded good. This morning I decided to play something I was sure would sound good. All of a sudden my mood picked up. Now everything I heard after that was reference sound quality.
I wonder if anyone else has had that kind of mood swing from one day to the next.