I second the conductor plate. The build up of fine contaiiments cause the solenoids on the plate to malfunction this disabling the vehicle.
When left to sit for a period of time, the contaiiments fall down then enabling the trams to work. ....for awhile that is.
Mileage indicates you would need this conductor plate. Even as preventative maintenance. I think you may have a drain plug in your torque converter as well as the pan.
So, a total replacement maybe avoided .
Let us know.. Good luck👌