Dell B1160 powers off after two hours

Hey,

recently I got a B1160 printer... nice piece of work for standard jobs.

However, I have discovered that the printer powers off after two hours of inactivity. The blue light of the power button is off and even sending a print job does not bring the printer back to life. I need to physically push the power button to get the printer on again.

Firmware B1160BW_V1.70.01.04

What may be the reason or how I can I prevent the device from switching off?

All the Best,

andiling