By the way guys, last week at my gig I had the most embaressing moment!

I was performing and in the middle of my song, my RHS (as in Jose's case) got stuck on one sound , one note and would not stop. Nothing made it stop except turning off the keyboard. Everyone was looking, I felt soooooooo bad . It happened like when I switch from a pattern that uses sounds stored in RAM to a pattern that uses the sounds in my Flash Card. I switch the pattern (by selecting the new numbers) then push DRUM SET and as soon as the new pattern goes in (or right around that time) I switch from RAM to CARD on the drum set, and thats when the X1 went "bazuuuq"!
Is it due to a not fast enough CPU or what is the reason exactly? Again, I have done this before and it worked fine, but now I dare not try it again in live.
Any ideas?