Do you know if they just reloaded programs, or specifically applied this TSB?Randomly my truck would be unlocked more often than locked when I checked (no remote in my pocket). My truck also drained the battery one night down to 8V. After bringing the truck in, they reloaded all programs including new versions for lights/ windows. I have not had either issue since the software update. I also had an electric trailer brake module toast during this event. Part just came in and getting replaced this week. If you experienced the battery drain issue, you should definitely bring it in for a software update/ re-flash.
Likely a bad/weak battery, along with needing the Battery Management System (BMS) reset. I had a 2018 Lariat and put a new battery in it a few months back from AutoZone (AGM). I also used Forscan to reset the BMS. No issues after that. My truck nearly left my stranded after a 45 minute drive, so I knew something was up. Previous to that I was getting the messages that you mention.Is there anything like this about the 2018 XLT? I bought mine last Fall, and several times during the winter (in SC...so not really even that cold) I would get a message the remote features had been deactivated. I suspect it could also be due to a lower rated (CCA) battery that could cause it.