Remote door lock intermittant even with new batteries.
 

I am having multiple issues with my keys. Both the RFID part of the key, as well as the battery powered RF door unlock function have both become unreliable at the same exact time. The resting voltage of the car battery is 12.3V. Is that the problem? According to a chart I found that indicates about 65% of charge so that seems like it should be OK. What would cause both functions to be unreliable, since I though they were seperate systems? Or is it incredible coincidence?