I have had this PC for about 1 1/2 years. Until recently, it would go to sleep, then wake up without any issues. The last few weeks, sometimes, it is either shutting down or crashing when it should be sleeping. I need to reboot the machine to get it back up.
There haven't been any issues, and I haven't added any new hardware in quite a while. What could be causing this? What should I look at?