I recently upgraded to Windows 8.
I found that a strange phenomenon is happening often during day or night hours (night hours being the most annoying).
I usually turn my computer "off" by putting it into standby mode so I can resume work fast when I need it. Tonight, it happened again: at 5:08 local time, without me or anyone else touching keyboard or mouse, the computer woke up from standby, waking me up too.
I got up and returned it to sleep by pressing the power button as usual. After less than 20 seconds, the computer woke up again, so I had to log in and shut down the system.
Motherboard is an ASUS Sabertooth 990FX. BIOS doesn't show any "wake up on RTC alarm" option. I don't think it could be a WOL signal (wakeup on LAN) both because my home network is under NAT without DMZ to my computer, and also because I don't think any other device in my home might send a WOL packet to my desktop. Anyway, BIOS shows no option about that.
About a week ago it happened in the middle of the day, thrice. I put the computer to sleep and less than 20 seconds later it came back to life.
Is it a hardware or software failure? How may I fix that?
Additional information about hardware. Here are the most relevant USB devices connected to the computer:
- Keyboard & trackball
- Smartcard reader
- Xbox 360 controller receiver (with controller turned off)
- 3D Vision emitter
- Bluetooth pen
- Android phone under charge
- USB headset
- Micro-SD reader