Z20 travel journeyman bb

My z20 slider thinks it has traveled farther than it actually has. It moves about 65mm and shows to move 160mm. It was working fine one minute then starting acting up. I reflashed the microSD and when that didn’t work I bought a new microSD and tried that. Nothing helped. Any ideas?

Is this a new z20 install?
I read somewhere that the z20 needs new software.

No, this is existing. Been running this setup for a few years now

DId you reset configuration as well?

Yes I did do a reset of the config after reflashing the OS