I used to carry a knife with me everywhere, but now society has vilified knives as weapons instead of the tools they really are. No more carrying in school, the office, courthouses, etc... so I usually just leave mine in the truck.
Craftsman, but not by choice, they where a gift. Except for the batteries whcih do not last anywhere near as long as they should they are fine. I still prefer my brothers dewalts though.
I had a similar problem recently. Brother thought he would be nice and wash the truck. Since it got down to 18* at night... yeah.... they froze. When it warmed up the next day I sprayed the inside with WD-40 and no problems since.