hi, new guy here, Bought a truck with this unit in here, lost the remote, bought a new one, programmed it and it worked fine for about a month, till the distance from the brain in the truck to the remote dropped till I now have to stand next to the drivers side to arm/disarm it, and it may take a min to do it. Battery in remote is fine, so its not that? Dont have a owners manuel with the 7hf, any ideas? thankyou