904 tranny issues

this is the second time I've had my tranny rebuilt. the first time it lasted about a week. then proceeded to burn up the second gear band. I pulled it out had my transmission guy go through it again. its been back in the car for about a week now and I just to go for a drive to go get my daughter and what do you know it feels like its trying to stick in 2nd gear again. wait a minute let me back up a little bit, the reason I rebuilt it the first time because it was definitely stuck in second gear . no reverse no first and no 3rd gear. it wouldn't even let me roll a car backwards with it with the engine off. so ith that being said. I just took it for a ride throttled it down and it down shift did but then when it decided to upshift felt like it was going to lock up. anybody have any suggestions?