Hello thank you for using JA let me see if I can help.
That may be so a malfunctioning speed sensor that is dropping signal will make the transmission cause all kinds of issue. I would recommend getting the vehicle scanned for codes first before condemning any sensors this will give a better indication of were to start. Any auto zone and larger auto parts chain stores will do this for free.
ASE Certified Technician
Ase certified Electronics, Brakes, Steering and Suspension