Trailer Brakes Disconnected message

I have the same truck and got the same message regularly. It was worse when it rained or on long trips after a couple hours on the road. It would start with a check trailer brakes message then trailer disconnected message, then would correct itself to normal and cycle intermittently. The last straw was when the brakes failed when I hit them after a truck pulled out in front of us.

The dealer checked the truck wiring and found no errors. I went over the trailer and cleaned and tightened all the wiring connections. This helped. Once at home I replaced the trailer plug and wiring right back to the block on the frame. Haven’t had a problem since and the brakes are much stronger now too.