Sounds like the same problem we had when we first got our GT last year. We described it to LCI customer support and they emailed a remedy. It is a problem called stiction. It is a simple remedy, following their instruction it went away immediately. If you google, LCI stiction, you will find plenty of reading on it to be sure it is the same problem. Hope this helps.
2015 Georgetown 329DS
2014 Chevy Equinox