Very good question, excellent answers! Thanks!
I had a situation yesterday where we shot outside in the cold, than hopped in a heated car, went to an other locations shot outside again back to the car and so on. Each time about half an hour in cold, 15 minutes in warm.
Camera and monitor worked perfectly, but a couple of screws came loose on my vest and a buckle fell off by the last shoot.
Must add that I didn't check on those screws the night before, since they always seemed pretty tight to me. (LX vest, load was not heavy)