Try pulling the dipstick quickly after experiencing the problem. Never seen inside these gearboxes before, but could there be the potential that if you have excessively high oil level you could be foaming your oil?
I remember from years ago being told that if the oil is being stirred up by the spiny bits due to high level, the oil can foam or aerate. This would then possibly mess with all your solenoids and actuators in the box.
If you pull the dipstick the oil should be smooth and even. If it is bubbly, then it could be an issue.
Just a thought.
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