I've been having a problem with my new printer at work. About 4-5 times I've come into work in the morning and there are pages printed despite my computer being off but the printer is on. Most times it is gibberish but yesterday morning I came in and there were about ten pages printed. Then this morning I came in and there was some code printed on two pages. I spent about an hour this morning with HP online doing a remote desktop on my computer. They removed the printer, reset it and reinstalled it. We'll see if that does any good.
Your HP printer possibly did an 'automatic' sw update. It may have gotten hosed. HP has auto update enabled by default on most of their higher end printers.
Simple solution: Turn off auto updates for the printer via the HP sw utility or the web interface.
Generally, there is no need for further updates (depending) if everyone in your
shop is able to print.
I'm no fan of auto updates on any
device. Much prefer other folks install the 'latest and greatest' sw first. Once I know a vendors update is solid then I install. Saves unnecessary troubleshooting time.
Over the years there have been many instances of 'all' vendors prematurely releasing a sw update that wasn't ready for prime time.