Every some days, exactly at 10.00 o'clock in the morning, the apparatus turns on and gives the message EPG0. The only way to get rid of it is: power off.

What means this message, what causes it?

Pioneer DVR-555H-S, HDD/DVD Recorder

Every some days, exactly at 10 o'clock in the mornign the apparatus turns on and gives the message: EPG0.
The only way to get rid of it, is power off.

Whart does this message mean and which cause is therfore?