sample suddenly mutes!!

im working in a proyect, and in one program i have all my samples in MONO,
in a different program and track, i have all my drums.

example:

TRACK 01 = PROGRAM 1 (ONLY MY SAMPLES)
TRACK 02= PROGRAM 3 (ONLY DRUMS)

i mute the track 02 to record my samples without hearing my drums so
i record the samples and they sound good, but when i want to hear both samples and drums, one of the 3 samples im using suddenly mutes :S (i already cleaned all the track but stills happens) BUT if i mute my drums, sample doesnt mutes ( its like my drums are muting my samples but thats impossible, because i have my drums in another program and another track!
i dont understand whats happening, i will aprecciate your help!

try messing with the volume of the sample? update your os if you need to. if its dropping out 100% then i really dont know but maybe try lowering the drums or other samples to get a good balance between.

sounds like you're maxing out the polyphony

the 1000 has 32 voices of polyphony. maximum. period.

this translates into 16 stereo samples or 32 mono samples simultaneously (and this doesn't mean the mono setting in the program, but the actual sample itself and its number of channels)