my sample stop at the half of bar

my sample (crash, or fx for example) automatically stop at the half of bar
what is wrong?

do you have other samples playing? very possible that you're mismanaging your polyphony. if you're not using jjos, get it so you can use the polyphony meter to see how much you're using.

for example.... my sample, crash, ride, bass play full lenght. When I record hats, my sample or bass or crash... stop in first sanre or second snare or between snares
All programs, all tracks, all samples are played in POLY.... Play: POLY
VOICE OVERLAP: POLY
MUTE GROUP: OFF
MUTE TARGET: OFF OFF OFF OFF

yup, definitely poly mismanagement. for your longer samples (open hats, cymbals, etc) that you know are overlapping, set the pad mode to MONO.

http://www.mpc-forums.com/viewtopic.php?f=25&t=105952
http://www.mpc-forums.com/viewtopic.php?f=15&t=95557

these 2 threads will help.

Also if you're not doing it already, make it a habit to trim your samples from the end as much as you can/dare so when the sample is not making any sound it's not eating your polyphony.

And make samples mono if possible. Stereo samples take up 2 voices of your available polyphony.

And if you have multiple samples layered on the same pad, resample it with the MPC's main out record feature so you only use 1 sample's worth of polyphony voices.

And set all short sounds to MONO playback, like closed hats, kicks or snares. Some exceptions here, but most drums can probably be mono.

And if you don't need it, turn off Input Thru. It uses some of your polyphony limit, I believe.