Has anyone seen this:

I am in program mode on my X1, and playing along with a pattern, and I turn off PROGRAM to go to the sound banks, and the sounds there (ALL OF THEM, even after stopping the arranger) sound like they have alot of effect and alot of sustain. So the sharpness goes away and its like your listening to a piano (for example) that is 3 miles away, and has a sustain going for ever.

This happened twice in two days in a row!
The first time I shut the keyboard down and turned it back on. The second time, I simple pushed EDIT SOUND (I wanted to see if the soundwave changed somehow), but nothing changed and when I went out of EDIT mode, the sounds came back to normal!

Any ideas?