Some HP futuresmart printers with firmware 5.3 can crash with an error 49.38.07 at intermitent times.

This issue doesn't happen on previous versions of the firmware.

What is happening

Any apps or solutions that register USB accessories using WorkPath or OXPd services are at increased risk of producing intermittent 49.38.07 errors on FutureSmart 5.3 if the (re-)registration of accessories fails. The root cause was discovered and is not found on prior 5.2.x, 4.x nor 3.x versions of FutureSmart firmware. 

For a more detailed explanation, you can follow this article from HP:

How to fix

Downgrade the printer firmware to a previous version or upgrade it to the next firmware update.