During my last oil change noticed some dark staining around where the motor meets the gearbox on the starter. Grabbed ahold of motor and it was loose!
There are some bent tabs to hold the two screws in place no locktite I could see. Pulled in a part and cleaned it up replaced the tabbed washers with lock washers (unlikely to help much) and blue locktite.
Due to the bad ground it was getting it was much more effective when starting it up. Spun up much faster, since it happened slowly I had not noticed it spinning slower.
Will keep a closer eye on now see how it does.