Hi! New to forum Merry Christmas to all! I have a 1998 Bravada which you know, is very similar to a Blazer. The power locks now have a mind of thier own. I can use the exterior rear gate power lock with the key to lock/unlock all doors. If I lock everything all of the switches on the doors work for about 10 seconds, then all of the power locks start making a motor noise and then all unlock on thier own??? Then when I try any of the door switches they are all dead at that point. Again I can go back to the rear gate and relock with the key in the rear gate?? Does anyone know what this could be??