Shuts off while driving, which module is failing?

I've had my vehicle listed above for about 7 months, but just recently it has been shutting off on me while driving. I noticed about the same time that my gas gauge would randomly go from full to empty and to half. So, I thought maybe I ran out of gas but got towed to the nearest gas station and filled it up. However, the gas stopped pumping after just 3 gallons. It happened two more times after that. Now when trying to drive it, it will go from 1st to 2nd and once it shifts to 2nd it just drops like it is in neutral and can't shift out of it until I park and turn the car off and back on. Also, to mention I have no reverse and the car will go in 3rd very slowly if 2nd is jumped quick enough and it drives till it's told to go into 2nd, and I lose the ability to accelerate. I ran an obd11 and got back codes p0720 which is the output shaft speed sensor. So, I replaced it, and code p0700 the Transmission control module. I cleared everything, but the same codes came back, this time including 2nd gear ratio not matching and same for 4th gear. I don't believe my transmission is shot. So can this problem be coming from the power train control module, the transmission control unit or is it one or pack of solenoids in the transmission. And I'm leaning as it not having to do with the ECU but I don't know, I'm hoping one or more of you have some knowledge on my situation and wouldn't mind sharing your experience, thoughts and opinions.
Thank you for reading.