ABE Sampler - Unexplained Pitching of samples

[MIAR]

Well this one has got me beat...

New blank project.
No hidden automation.
Sampler triggering multi sampled drum shots.

After about 5mins of looping a few bars, the samples sound like they have pitched down a few semitones.
If I close/reopen then ok again for 5mins or so. Then pitching happens again.

48KHZ in DAW and RME card setting.

Any ideas?

[MIAR]

Figured it out.

My Midi controller keyboard is dying. Sending pitch bend info randomly