Transmission

Just started where it will not move unless rpm's are high. Once out of first I switch to second. And it goes slower. And just stops and shuts off the car. I let it cool down for an hour and got back in it it did fine. Drove it sixty miles no problem. Left again while it was still running and would not hardly move. Felt E-brake was on but was not. Rpm's went high and it would barely budge. Not sure what it is.