I have a 2005 Yukon xl slt and I'm having a rr window problem. From the drivers window controls I can put the right rear window down but not up. If I operate the window from the rr door control it works fine. If I engage the window lock on the drivers door, it appears to operate as it should as I can control the rr window up and down from the drivers controls but the rear control is locked out. Here's the weird part: if the rr window is down and I take the window lock off, it goes up on its own without me pushing anything. Once the window goes up its disabled for about 20 seconds, i hear a click and the the operation returns to how it was before. Any idea what would cause this?