IMO it is very hard to determine what is causing your inconsistant arrow flight without being there. But if I were to troubleshoot your condition I would look at several things:
1. Shooting form (Probably the lowest possibility)
2. Something that may be easily overlooked is nock pinch. Is your D loop pinching your nock to tight.
3. Fletching contact. Could be with your rest or could be with your cables.
4. Bow went out of tune (did your rest or nock set move?)
5. Bow timing is off.
Like I said, it would be hard to determine what your problem is without 'hands on' knowledge. First thing I would do after detemining there was no fletching contact or nock pinch is to do a walk back.