I drove from Northern Virginia to Blacksburg recently. We've taken the route a number of times to visit our daughter at college.
The Rivian network charger in Roanoke was more expensive than any other charger on 81. Also, the fastest.
Just a quick data point. I experienced the same problems as above with a set of EVGo chargers on a recent trip. When I abandoned using the EVGo app and just paid using a credit card, I was finally able to charge. I didn't have much of a choice given our location and some other out-of-service...