Recently my server has started putting itself to sleep, and I have to manually wake it by pushing the power button. At first I thought it was shutting itself down, but after waking it will show an extended uptime (hours or days, not minutes). Any ides on what could cause it? It has the following specs:
Intel Celeron G3930
4 GB RAM
4 SATA drives - 3 HDD, 1 SSD
Thermaltake 750W PSU