Thanks for the help. Intermittent automatic transmission sometimes it wont move in any gear.

If this is only doing it at startup , or intermittent, I would suspect fluid or valve body .
These things are very dependable usually .
If they are acting quirky,,,,it’s usually something minor .

Yes,,,there are several things that it could be,,,,but even then,,,those things dont just fix themselves .
If it’s really something bad,,,like a servo blown out or a bad band,,or bad clutch pack .
It doesn’t just get better,,,it will stay bad .
Good luck .

Tommy