A possibility.
TDR forum, same year truck, same issue, but totally dead switches (not intermittent), even after a new switch assembly.
"Just an update: I did take the truck to the dealer, who was certain it was the set of faulty switches. He did order, installed...and still the buttons did not work. Then he checked for power at the switches and there was none. (I would have thought checking for power should have been step one??) Regardless, they followed the power to a corroded spring type connector, replaced the $1.20 part, charged for 3 hours labour and sent me on my way. All is working."
IMO, get off RVnet and start researching other sites.
I just googled your issue and there is a bunch of info about it.
