If those readings are accurate, your power supply is well out of spec. and could be causing the problems you described.
When I refer to "if the readings are accurate", I don't mean your capability of reading them, but whether the various sensors are giving accurate information.
To give you some idea of a comparison, I just checked mine and came up with the following;
3.3v = 3.41v
5.0v = 4.93v
12.0v = 12.19v
These are the sort of numbers I would expect to see and in particular, your 5v line at 4.25v is way off.