For a while, I’ve started to notice that my HP Z3200 would have connection problems with my computer (Mac Pro hooked up via USB). For example, after a period of non-use, I would not be able to use the HP printer utility to access the paper calibration menu. This printer control panel item would simply time-out after a few minutes and I would need to reboot the printer by turning it off and then on again. Another issue that I’ve had is that some menu items such as the troubleshooting menu were not accessible either (same time-out problem).
Yesterday it occured to me that maybe I should try using an ethernet connection instead of USB. So far this seems to have solved the problem (I can access all of the items in the printer control menu). I am keeping my fingers crossed.