2007 GMC Yukon keyfob works intermittently. The keyfob will work when the car is running and immediately after shutting off the car. A few minutes after walking away from car it no longer works. If I unlock the cat with the key it will not start, radio and all accessories will turn on and it displays antitheft on the radio, eventually after turning the key off and on several times the doors will unlock and it will then start. I replaced the RKE module and took it to the dealer and had it reprogrammed and it was fixed for 1 day, but now is having the same issue. Does anyone have any ideas what the problem is and how to fix it, or know how to bypass the antitheft system so I could just lock and unlock it manually and start with the key?