My wife has a 2011 Tahoe and we are having problems opening the rear gate. Rear gate meaning the entire rear door not just the upper window. The upper window opens just fine. It was cold out last weekend when we first noticed the issue and I thought it might just be frozen. It has warmed up outside today though and the gate is still not opening. It is an LS version if that helps. What do you guys think the problem could be?