Most common cause of slide creep (in or out) is a failing solenoid at the manifold. Since your slide/s are held in position by hydraulic pressure, any leak could cause creep. If you have any obvious fluid leaks at a hose fitting, that might be the problem. If the solenoid that holds the slide in the outward position is failing, it will let the slide creep in.
Another possible cause is an internal leak in the hydraulic cylinder (ram) that pushes/pulls the slide.
If you are able to do some troubleshooting, suggest you call HWH and one of the techs will walk you through some tests to help diagnose the problem.
'07 Country Coach Allure 470 Siskiyou Summit #31578, Cummins ISL 425; 2014 Ford F150 toad; Air Force One Toad Brake.
Glen Allen, VA; Smith Mountain Lake, VA.