Car takes calls and leveling, load weighing, and terminal slowdowns look good. Happens about every 8 or 10 runs. Running at speed and no specific location in hoistway. Not terminals. Verified adon 3 hoistway and car safety chain inputs with meter set for minimum record.
Ideas?

adjusted 5-20-9 to 150 and good to go.

Did you change to an adon 3 board? Then changed 5-20-9 to 150
And problem went away?