Is this problem affecting only clock or everything else like trip stats, preset radio stations, your phone pairing?A couple of times in the last 2 weeks, my clock has reset to 24 hour format and the wrong time zone. Any idea how to keep this from happening? Would different key fobs have anything to do with it? Just a wild hunch.
If everything else is OK, means no issue with your main battery. More likely cold solder joint on the clock circuit or clock lithium backup battery. I suggest you to take it to the dealer.this is the only thing I've noticed so far.
I've had the same issue. Went into the menu and there was an available software update. Hasn't done it since..fingers crossed...A couple of times in the last 2 weeks, my clock has reset to 24 hour format and the wrong time zone. Any idea how to keep this from happening? Would different key fobs have anything to do with it? Just a wild hunch.