UNITY 5 Shadon flickering (only started after upgrade to 5)

Hi all. I NOW have this problem with shadow flickering like this guy

Only started yesterday. I have it on most objects plus terrain with nothing under it (I have read posts wjere people are talking about the z-buffer but there is nothing under my terrain so I cant see why it would happen to the terrain??)

Any help would be very much appreciated!

I have exactly the same problem.