technical guru's...I need help!

My XL's data dial is going out, ok, I know that's an easy fix, but my main problem is that when I chain sequences, sounds assigned to 'note off' or midi information is non-existant. If I have a bassline that's note off, everything else will play, except the bass... now, if I stop the sequence (cuz I'm confused that the bassline dissappeared) and play it again, the bass comes back. Switch sequences again, and voila, note off/midi sounds are gone again. It plays a millisecond of the sample and then stops, almost like a serious decay. My MPC only does this when it's been on for a few hours (anything more than an hour, not 5/10/24 hours! ) . I don't want to take it in the shop because they may not notice it, and I don't wanna shell out $80 an hour for someone to turn my MPC on, re-pack it, and tell me nothings wrong. What should I do, just sell the MP and grab another one? I have a strong personal relationship with my MP, a new one just won't be the same.

http://www.soundclick.com/creamofbeats

I can't offer the technical help you need but ...... I wouldn't try selling your MPC with a problem like this as the new owner is going to find it pretty quickly. You might find you are paying for your new MPC & then also paying to refund whoever you sold your original MPC to.

" I wouldn't try selling your MPC with a problem like this as the new owner "

Yea, I know.. I have a few offers, but I made sure I let them know what was wrong. Some folks just REALLY want and MPC. I figure I'll sell it for like $400, and I'll buy a brand new one. I got this one off ebay about 5 years ago.. and I'm sure I put many thousands of hours on it.