Hi, I am John Mc, a Ford dealer tech.
I hope I can help you quickly and accurately.

This is a very common issue with these transmissions. It is usually caused by the solenoid pack in the transmission. There is bad news that goes with this. A lot of the time the solenoid pack causes damage and can break the bands and/or cause damage to the servo pistons that control the bands. If this is the case then a complete overhaul will need to be performed on the transmission including some machine work to the transmission case so this failure does not repeat. Sorry for the bad news but I have repaired many of these and have seen this problem many times.

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Thanks,
John Mc

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