Lumia 920 Overheating & Battery Drain

I've heard this issue arise on a lot of 920's. I've had 2 myself (thanks to a dropped/cracked screen). We have a bunch of 920's at work. Even my some family/friends have one. It seems that everyone one of them from time to time suffer from the overheating & battery drain problem. I haven't managed to find the cause and was hoping that maybe GDR2 would fix it. Anyone find a solution?