If you can supply a short video as well, that would be very handy. Cheers :)
Sorry took me a little while to get back to, I did record the screen once start doing it again. I wasn't doing much just moving around and it triggers the problem.
What i've tested so far:
Diferent renders, vray, arnold and physical ( no problems found)
messing with viewport settings low to - high details (problem persisted)
Corona 7 hotfix 2 and beta 8 (problem persisted)
R23 no problem
S24 and R25 ( problem persisted)
Reinstalled version 7 and 8 (problem persisted)