Check your Power Options. I use a controller on mine, and if I don't hit the keyboard for chat or tap the touchpad often enough, the standby timer kicks in briefly after a while.

Don't just go with the standard plans that show up in the branded power config panel. You will want to edit a plan's settings so you can get at the advanced settings screen---windows has a LOT of options available that may not show up in the default plan settings. I usually just run powercfg.cpl so I can always find them. The proprietary software <should> show it's profiles in there as well.