The most likely cause is a fluid issue however, it could be something more complicated.
So, let's start with checking the fluid and making sure it is not low or in poor condition.
Here is a guide that will help with this:
If it is, then we need to change the fluid so here is a guide that will help with this as well.
I am attaching the process from the manual below as well.
If this is not the issue, then we may need to get further into the transmission and inspect for a pressure issue.
Let me know what you find. Thanks
Images (Click to enlarge)
Sunday, December 19th, 2021 AT 3:04 PM