Have a '98 4020 with a 88HS control and the following has happened many times and is reproducible.
It happens when you first change a program from memory.
I switch programs, run the graphics on it to make sure it's what I wanted.
When I get out of graphic mode the control is back to the previous program.
Anyone experience this?
Also having a problem with rigid tapping but I haven't narrowed that down at all.
Seems hit and miss but it could be a high/ low gear thing or in the grammer of the code.
Almost like a CMOS battery died and settings were lost.