DDM problems

[cjessee73]

I'm new to the forum. I have a 2006 GMC Sierra 1500 Crewcab 4x4 SLE. 

My problem is somewhat intermittent. Mostly on rainy days the drivers door lock and all of the controls on the drivers door will not work until in unplug the unit for a few minutes, then it will usually work. 

Also this is an old company truck that was used in a limestone quarry for the last year or 2 before I bought it. 

My question is, if unplugging the switch assembly gets everything to working again, is the switch assembly the likely culprit causing the issue or is it possibly something else?

Any help will be greatly appreciated.

 

This truck has heated seats and memory for the seat and mirrors. The mirrors are also power folding and auto dimming with turn signals. One additional note is that the power drivers seat and seat heaters for the drivers seat have not worked in quite some time. 

Thank you for any help.