Stuck midi notes

Controlling my xpander with the monomachine.

Pretty awesome. However, after a little bit of poly Seq’ing I get hung notes on 4-6 voices. Ive tried to isolate the issue, but cant seem to figure out whats causing it. Im not familiar enough with the monomachine yet to pinpoint if it’s the MnM or the XP.

ANy ideas guys?

Thanks in advance <3