Logic Pro x

Hello! I am looking for assistance with a MIDI issue I'm currently facing in Logic Pro X. Anytime I'm recording MIDI with any plugin (Logic or third party) the pitch will randomly begin to pitch bend by a semi tone. It's driving me crazy and am desperate for help! I can't seem to find any answers. I've even called Apple's help line and they haven't help so far. If anyone can help me fix this problem I'd be very grateful. Thank you for your time!