Sony F5 footage crashing Premiere CS6

Need some urgent help. Shooting on the Sony F5 tomorrow. Shot some test footage. The footage is XAVC 1080p 4.2.2 100Mbps

I import the footage (drag and drop) and it appears and shows in Pr. But when I try and do anything with it, it crashes. I have a fully up to date version of Pr.

Switched to Mpeg2 50Mbps and it works fine. But what if I want to shoot XAVC???

Thanks for any help!