Elecom M-XGS50MBSK Series User Manual page 71

9) On the "Power Options" screen, click the "+" mark in "USB settings" from the list, and
then click the "+" mark in "USB selective suspend setting".
10) In the drop box next to "Setting", select "Disabled".
If you are using a laptop, there are two items instead of "Settings": "On battery" and
"Plugged in". In that case, please set the "Plugged in" setting to "Disabled".