Have you ever hated the sound of your system one day, and loved it the next?

Uh, chaps, level is one of things you CAN control. It is not what this thread is about, which is why the system oft sounds different day to day for NO APPARENT REASON. It’s a mystery. Level has nothing to do with it. Weather affects the power grid, thus even high end designer electronics, which apparently you chaps are completely unfamiliar with, one must conclude at least, are subject to the vagaries of the weather.

Pop quiz: has anyone who’s paying attention noticed his system sounds really good for no apparent reason the past few days?

Notwithstanding my point that you should concentrate on the music, not the sound, there is no doubt that the quality of the sound can vary from day to day.  And that difference can be significant! 
Right now I’m listening to a CD (Shostakovich’s 8th Symphony with Gergiev conducting) which sounded dull and lifeless a few days ago. Today it’s blowing my socks off!
The trick is not to let that bother you so much that you can’t get past it and hear the music. This can be difficult with very dynamic music.

Bingo! That’s what I’ve been waiting for! 4 days ago I indicated something wonderful was coming in a deleted post. A bit like Babe Ruth pointing to the bleachers prior to smacking a 500 ft. Home Run. ⚾️ It’s always good when someone actually can hear.

Yes. In my case it happened because I went away and turned everything off. I came back, and for the next day was wondering what had gone wrong. 

Of course, this also happens from changing room acoustic conditions. 

Best,

E