Maybe it's your Park, reverse , neutral switch. Squirrels and mice have been known to chew at those wires because they have a nice place to sit while chewing. Next time you look at the top of your tranny watch for chewed wires.
So today I checked the wires going into the park,reverse,neutral switch, and did not see any issues there......also looked at the other wires as well....most all have the plastic protection tubing over them.
I was thinking maybe the switch itself is bad....but I researched the symptoms of a bad one....and I am not experiencing any of those issues.
If anyone else can help with what they think it could be....I would appreciate it