MPC 1000 Problem

I have a sample of +/- 5 sec. that cuts suddenly when it s played in my sequence...
It doesn t have anything to do with poly or not or note on and one shot.
When the loop sequence isn t playing and I press the sample on the pad it plays correctly till the end but somehow when I press play and the sample is played it stops at a certain point...??
HELP!
Thanks

maybe you've reached ur limit?
what happens if you mute a few other tracks?

I'VE HAD THAT PROBLEM BEFORE.