2007 XR. Just installed the aftermarket Rose/Carshow GM1210 radio, navigation, and backup camera. Now, sometimes when I get out of the vehicle, I push lock on the key fob and it will not lock even though I am still very close. I tried pushing the unlock and the lights "flashed" so the signal seems to be reaching. But this time, it would not lock until the 30 seconds passed and the headlights went out. Any thoughts?