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Remote Keyless Entry on 2007 Buick Lucerne

Mt remote door/trunk FOB will n ot unlock the door/trunk after the doors have beenclosed for a couple of minutes. If I unlock the door manually and open it, then the FOB will work fine. What could be causing thsi problem?

Asked by for the 2007 Buick Lucerne
did you get an answer yet? I have the exact same problem and have replaced the batteries a couple of times and it doesn't help at all. its almost like it times out after a few seconds.
I unplugged the reciever for s few minutes plugged it back in and it worked fine. Has been working ever since