It does not engage and dis-enage the converter when in DoD/AFM.
You are likely at the point where the load on the motor is causing it to enter DoD and leave DoD fairly often because that is all dependent on vehicle speed, engine rpm, map kpa, engine load, pedal position etc etc. It does not take much for it jump in and out of DoD and that's more than likely what is happening. At 50 mph I bet you are barely over 1300-1500rpm with the 2.93 gearing and thats a pretty high load situation on the transmission.
And the converters are actually one of the smallest issues with these cars. The heat kills the fluid, which kills the clutches which makes them burn up and start slipping. Or the solenoid problems and Torque converter clutch solenoid issues.
