In case this happens to anyone else, it turns out that the problem was that the inline fuse holder between the solar panels and the controller, was no longer holding the fuse all the way in, over time the vibration from driving (and a lot of dirt forest service roads, not gonna lie) has loosened...
About 2 years ago I bought from Amazon, 3 100w Renogy Panels, the ROVER 40A Controller and 2 AGM Batteries (155ah each). Installed them on/in my van and they have worked fine for the last almost two years.
Yesterday afternoon I was cleaning and noticed that the Controller claims it is...