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Debris build up in the transmission valve body can be a common cause for this fault here.I have had to perform a transmission fluid flush to remove any debris and dirty fluid and install new fluid at the same time with a flush machine.
I have also seen where the pressure control/regulating solenoid can act up in the valve body in the transmission as well as the valve body itself needing replaced.
If you have not had a flush done I would try this first.If this does not work then I would have the valve body tested to see if it needs replaced or rebuilt to resolve this issue.Usually since you can cycle off and on the engine and it works properly for a short time it is an electrical fault and the pressure control solenoid can be most common needing replaced.
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