My machine lost it's positioning last night on the last part. Everything was working smoothly the entire day. The only thing I can think of was that I was vacuuming near the machine and at one point I got a static electric shock off the vacuum. My back was turned to the machine so I can't say for sure if the timing was coincident.
The vacuum is on a separate circuit.
Any thoughts or suggestions? UPS? How do you determine the size of UPS?