Sample dumping out!

I know this ? has been asked and I did my research about it, but I still have the same problem. Well when I go to sequence my hi-hats after the sample, kick, and snare are already layed down on their individual tracks the sample dumps out after 2 bars. Like I said I looked around on the forums and I know it's been asked and my parameter is set to poly but it's still dumping the sample out after 2 bars. What do I do next could it be that I don't have enough memory?

setting your samples from monophonic to polyphonic isn't gonna help you. you are running out of polyphony - too many stereo samples set to trigger polyphonically.

sample often repeating hits (drums, esp hats) in mono. set all drum samples to monophonic and chop small.