Remote door lock started acting weird ... ideas?

When I try and lock my doors using the remote fob, the lights don't flash and the beeper doesn't sound, but I can hear the locking mechanism work (and all the doors do actually lock). Additionally, the lock sensor on the door handle no longer appears to do anything. I tried my spare fob, same thing. The weird thing is when I unlock with the remote fob, the lights flash and the beeper goes ... just once, instead of twice like it used to. Sanity check me - am I missing something dumb?

 

Mine is acting weird lately as well. I wasn't sure if the batteries were low in my key fob or what. I sometimes have to press it two or three times to even get it to lock. never a problem unlocking. also the lock sensor on the handle is working , but instead of it being instant like it used to it takes a couple of seconds. Of course service said there wasn't anything wrong with it.