4l80e help needed

[Jer784]

So I had reverse band cash out in my 4l80e, put a complete rebuild kit in clutch packs, pistons seals bushings etc. Transmission worked fine for 900 miles. Took it out the other day to my camp,  nothing to terrible went to leave and had no reverse. Checked fluid dipstick showed it was low with the trans warm , added some fluid backed up ok. Left my camp heading for home got stuck. I did not do and forward reverse fast shifts or nothing like that. Waited for a friend to come pull me out and truck wouldn't shift but if 2nd gear and no reverse. Brought it home did a quick scan with my cheaper computer and it showed shift solenoid stuck open. Reset the code took the truck down the road and it shifts into all the gears and has reverse, until it warms up then goes back into limp mode again I'm assuming didn't get to scan it again yet. Won't shift out if 2nd and has no reverse when it does it. Any ideas would be gratefully appreciated.