The electrical variance could well be enough to cause problems. On most machines they want it within 5%, yours is out of that range. Another common problem on used machines is the battery that backs up the operating system is dead. When you power it off it loses it's memory, and you have to re-load the software and all the parameters.
I never shut my machines off, the control, servos, and pumps are constantly running.
Cheers!
Roy Solomon