So this is a bit of a weird one for me, I'm 17 years old and got my truck a year ago, when its hot outside and the truck idles for like maybe 30 min and i get on the road it will shift into like a fake 4th gear and wont let me out of it until I turn it off and back on. Everything I've looked up leads to a shift solenoid but I'm not 100% sure, any idea on whats going on with it?