I had that problem and fixed it by lighting three fires and sitting between them for approximately 5 – 10 minutes. I have heard others say that the problem was fixed for them in the same manner, though they put the time at 15 minutes. If you have already tried that and have not seen improvement, then hopefully the devs are working on dealing with that in .53 (it has been addressed on feedback.dayzgame.com, so they at least know about it).