Recommendations of fixing my P0270.

What is your question?

My F150 occasionally pops a P0720, Dash shows the wrench (briefly) transmission indicator generally shows 5th gear, and speedometer stops working. I have an ODB II gizmo that transmits via bluetooth to my smartphone with this indicator. CEL does NOT turn on. If I stop / start the engine, all works as expected... till next time. One trip of 120miles it happened 4 times, on the return it did not happen. I have not noticed the transmission slipping or driveability issues. However, there is a fair amount of slop in the differential. I purchased this used was a fleet construction vehicle w/245k miles. The P0720 will show in history and/or pending. After some mileage it disappears... till it shows up again. Recommendations?

How long has your 2013 Ford F-150 had this problem?

Off and on since purchase (used) Sept 2019