UNEXPECTED ERROR means that the programmers for your software were: A. too lazy B. inexperienced or uneducated or C. Rushed - - to trap the error that shut down your job. Trapping the error means that there is a routine in the software that catches the errors (something as simple as one pixel that has a value out of the printable range can destroy the job) and changes the values into something that the printer can handle. Rare errors are frustrating because there is no tracking (again a reporting routine could be in the software but isn't) but consider this = = 20,000 machines with one "rare" error every six months that ruins 10 feet of material is almost 76 MILES OF MATERIAL EVERY YEAR.
Yes, it is - 20,000 machines x twice per year 2 x 10 feet / 5,280 feet for a mile is 75.75 miles.
I'm gonna shut down my shop and start selling media!!!