The comfort switch is a rotary control like a volume knob and they either wear out the track or the track contact arm comes off.
If your are handy (and very patient) you can dismantle the switch and refix the track arm, alternative is get a replacement.
If you go down this route with the seat side panel off you can see the micro switch that activates the seat movement, it could be out of line, seized or bad contacts.
Use the reset process if you fix or replace.
regards Eric