Good morning.
The first thing I would do is to change the oil/filter in the transmission.
a clogged filter will cause this issue. How long has it been since the transmission fluid has been changed?
If the filter is good, then you have an internal failure in the transmission.
Roy
https://www.2carpros.com/articles/automatic-transmission-problems
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Sunday, May 6th, 2018 AT 6:55 AM