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When this happens you will find that the trans oil cooler may have a blockage ,or a nick in the hose from the trans to the oil cooler .
Trans fluid filter blockage also a good possibility.
But first make sure that the vent is clear ,the top may move but could be blocked ,check at your ford dealer i think they have an updated vent to cure this problem.
If the car is changing up and down and no drivability issue i'd replace the vent tube.
if needed please get back to me with the reply button, and not the poor or bad service, this way i can get back to you or suggest another expert if needed.
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Kind regards Greg.
I'm sure it was a sticking vent tube is a common issue ,
next time you open the engine bay check the dip stick they are known to stick
out a few inches ,this will tell you its the vent tube .