2nd gen won’t shift into 4th gear

Hi all, I’ve recently been experiencing a bit of an issue. I was driving home the other day, and had to brake a little harder than usual and upon accelerating, my truck would not shift out of 3rd gear and the rpm’s just kept climbing. I was able to shut the truck off and it didn’t do it when I started it back up after a couple minutes. I was able to replicate the issue 2 more times while braking hard to verify they were related. The truck is a 2013 with the 4.0 4x4 automatic. Anyone ever experience anything similar? Plan on changing the trans fluid first to see if that helps.