Torque Converter or Bad Trans

Also ATP AT-205 is an excellent transmission additive, will bring a sluggish transmission back to life.
I did have a torn piston seal one time, no additive will cure that.i think way back,i had to back off so third would engage.

Knowing if it acts different from cold to hot, or just once in the morning will be helpful. Fluid/filter change or is fluid low? A few things to consider.