I have had a bit of bother with mine too, the problem I have is that the fob will work fine for any amount of time, lock/unlock no problems, then for no reason whatsoever wont unlock with the fob for days, leaving me red faced with the alarm screeching away lights flashing as I drive head down away from home, till it's had enough and stops!
I have changed the fob battery several times but this seems to make no difference, I now dont trust it and lock with the key and only unlock it with the fob. Any one had this problem?