I have a 1998 4runner with the factory RS3000 alarm that comes on it and am using the original key fob. Just recently...the alarm decides not to beep sometimes when it is unlocked with fob, or locked. Sometimes it will beep on unlock but not lock...or it will go a whole day with no beep. Other days/weeks its fine. Any suggestions? A short maybe? i dont get it. THANKS for any help!!