I had the exact same problem, after a successful 2017 season and 2500kms on the trailer.
I pulled it out this year and on our first trip I had the same symptoms and error messages you are seeing. After crawling under it and checking everything, and checking all the connections in the junction box at the front of the trailer, I couldn't find a thing.
Fast forward: despite being embarrassing, it was the 7-pin connector and how it was plugging in to my truck. It looked plugged in, it felt plugged in, it was no different than last year, however this time I was getting intermittent brakes and error messages. The flap on the receiver on the truck was even holding the plug in place.
The issue was that the rubber casing on the male end of the 7-pin connector is tight at each terminal, and wasn't letting the connection fully plug in. While it looked ok, it wasn't. I realized I had another eighth of an inch that I needed to push this plug in, and it was hard - took a lot of pressure to get it to go all the way in.
I was happy with the fix, but it was humbling as all hell. Works great when you actually plug it in.... HA!
Try it - maybe the same thing.
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2015 Ram 3500 Laramie Crew Cummins Diesel
2017 Whitehawk 28DSBH
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