Perhaps I'm unique in this regard, but I find I have days where I am just "on", and other days where I just feel uncoordinated. There are days where I feel like I can play anything and it's so easy, and others where I think "I used to know how to play guitar".

There are times where I felt this "on" sensation after practicing dilligently. At other times, it's been after a week of not playing much. It follows no rhyme or reason. I can come up with reasons...but they are inconsistent.

After playing for 35 years and still experiencing this, I don't think it's gonna change any time soon. I chalk it up to the fact that in general...some days are better than others.

When practicing and this happens...I've learned to just walk away and come back the next day. I've tried "plowing through" and that almost never works. Better to step back and attack it another day.