2007 duramax transmission hiss/slip on freeway

[Big white]

Hello recently my transmission will slip at freeway speeds is it like pops out of gear with the big hissing noise I'll lift off the throttle and it'll go back like nothing happened it's been happening on and off now becoming more frequent has anybody experience this condition also edge programmer popped wheel speed sensor code and transmission control unit code. The transmission feels fine until it does that no unusual noise vibration but then all the sudden whoosh again it all started when my toe hall light came on for no reason so I don't know if it's an electrical thing, solenoid thing,a clogged line ,a pressure thing I have no idea please help very frustrating