Our 90 ton link belt has lost its boom/ cylinder location a few times. The operator that runs it the most, has been in it each time. After the third time, I was like "why is it doing this"?
Turns out, each time he had shut the crane off with the boom extended, for lunch/ break/ discussion, it sometimes looses the location of the tele cylinder, and then you have to do a complicated "reboot" to let the computer locate the telecylinder.
I just told him to not shut the crane off with the boom out, and it hasn't happened again. Don't want to suck boom in for lunch- let it run, I would rather burn the fuel than have to go through the whole length reset.