Rear Hatch Issues when hot

[Rcktman]

Good morning! New to the forum. I have a 2012 Tahoe LT that does not have the power rear hatch. I've been having some problems with it. When it's hot outside the rear hatch will not unlock - I've tried using the key FOB and the door lock switch with no luck. Once it cools down outside, everything works fine, the hatch will unlock and open as it should. I've replaced the hatch lock actuator and the actual pressure switch in the rear handle but still having the same issue in the heat. Am I missing anything else? It has been driving me nuts and I can't find much on the internet about this type of issue.