Yes, it's psychological, laddie! I have seen some of my profiles magically transform from glorious into bad and then back to beautiful without me editing them, same guitar and all...
It's the old guitarist's curse. Usually your playing reflects your mood as well.
Welcome btw!
Yes."Psychology".Actually the only reason I dont "trust my ears" anymore..
In the good ol´times of tube amps me and guess most other players blamed it on the tubes or whatever.But as older you get as more and more it becomes clear that it is you.Just you and your mood.It is disgusting and for a long time I did want not to believe it but this is the only truth.And one of the reasons I learned to trust sound engineers who are cold as ice piece of shits..half human,half frequency analyzing machines with no "mood" or anything that could remind you of a sensible,whining musician.. 
Leave the drummer alone.Blame the bass player.At least these guys deserve it. 
