[Antiphones]

I've been using PT 12 since it was first released without issue. Recently I am intermittently having automatic delay compensation issues. I notice that the snare starts to flam. When I turn off the overheads the flamming stops. If I turn off all plugins there is no flam even with the overheads are on. Zooming in on the waveforms shows that the overheads are not out of alignment with the snare.

The the problem will then disappear all of a sudden and everything is fine for an hour. Then it returns. This happens without me doing anything I'm aware of. I cannot track it down to any plugin in particular.

Does anyone one have any idea what could be causing this?

Thanks.