HP Officejet 8600 is an awesome printer and scanner and the only complaint I have is when it won’t communicate with my PCs for scanning or printing. What is going on is the sleep function kicks in and even though you can connect to the printer status page.
Read all the solution and disabling sleep is not going to extend the life of the printer.
My simple solution:
Connect to the printer via browser to the printer’s IP address (can be gotten from the printer’s control screen by pressing on the wifi icon).