I know this issue is unrelated, but since it happened recently, I thought I'd post my experience.

The other day, I went to the window tinting store to have a window re-tinted and when I got out of my vehicle the fob wouldn't lock or unlock the doors. I thought maybe my key had died, but once I left, the fob started functioning the lock/unlock features. I went back the next day to have the work completed and again the key failed to operate. It turns out the power lines above the store are the high cancer causing sorts that you don't want to be around for long periods of time. Apparently high voltage power lines interfere with the keyfob. I'm not talking the power lines that run down your street (unless you live off Parker Rd.) these are the kind that are mounted on the big steel power poles that you usually see traversing open space from city to city.

Anyhow, I'm guessing your issue just came up out of nowhere with no environmental changes in your area, which means my situation doesn't apply.