Initial video drift

I'm trying to trouble shoot a client's recently upgraded PT rig.

PT HD 12.2.1
Mac OSX 10.10.5
Blackmagic Decklink
JVC projector
Video offset checked with Syncheck II

I've not had a lot of time to test this but at the moment it looks like the video has an initial offset of just over 4fr, but after about 25sec this will have drifted back to a steady 2fr. There doesn't appear to be a drift after the initial 25fr.

Has anyone had similar experience and know of a cause or fix?

__________________
PT10.2.0 / HDN / HD Omni / MC Control / Intensity Pro / Quad core Intel MacPro
Over 15yrs experience in TV. Currently mainly indie features.

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Initial video drift