Both of my comfort access fob’s suddenly stopped working. Recently I found that they worked to open the car when standing at the trunk and pointing it at the real taillight at the top of the trunk door. This now doesn’t seem to be working either. It’s definitely not the batteries, I replaced those and I’ve checked the fuses. Is this a diversity antennae?? issue (I’ve been seeing something about this in other models) and if so is this something that I can order/ replace myself?