I suggest you start by resetting the camera.
See Page 98 of the User's Manual to see how to reset the camera.
That resets the camera to factory settings.
The problem you describe sounds like it can be a battery problem
It the battery is weak, it will not function well in cold weather.
If you are using NiMH rechargeable AA batteries, you may have one bad battery.
I would replace both batteries and see if that solves the problem.
I'm surprised they still didn't release a new firmware for this camera yet!
I was out on a trip to Texas and I was taking pictures, and as I was browsing through pictures on my camera, it locks up! So I had to just open the battery door and close it to reset the stupid thing. What's taking so long for a new v1.1 firmware to become available to address the freezing issue? In fact, now that I think about it, I had taken the camera outside several times before and temperatures outside were below freezing. It would even lock up when the lens is extended, or even when the lens is still in the camera (resetting the power causes the lens to contract). I'm surprised it didn't corrupt my photos and videos.