Have you got BroadBand? If so, check whether you have "wake up on lan" enabled. My machine does exactly the same thing as yours and I can only put it down to this. So I switch off at the wall.
Samsung Galaxy S8 review
1995-2015: How technology has changed the world in 20 years
This poetic animation about monsters is illustrated in a Van Gogh painterly style
Apple predictions 2017
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.