Key fob works during the day and after work it doesn't. Key fob flashes but doesn't unlock doors. It's not the battery in the key fob because I replaced it and it acts the same. I reprogrammed the key fob and same behavior. Bought a new key fob and programmed it with the same result. Any ideas as to what's causing it to not work only sometimes? Tired of my car alarm going off because I have to unlock it with the key.