Midi wont stop

I'll be playing some strings or some synths on my mpc 25k and sometimes the sound/midi keeps goin on and on after I let go of the keys. I have to press the stop button on the mpc to get it to stop.

Can I fix this or is it just one of those things....?

You can insert a note-end event via step time when this occurs. It can happen when you stop your MPC recording while holding a note or your sustain pedal