My 2018 SR5 is terrible on the highway in wind. Moving all over the road, and you have to counter steer all the time to correct. I was kinda blaming it on the high sidewall tires, but don't know if that's the only problem. Very annoying and making me want to get rid of it. Only bought it in...
I had same issue. You need to divide your jump drive into folders, with no more than 498 songs per folder. It will read all songs then. Just hit the random button and you're goo to go.