We'd like to know some more information like when this happens, what you've done to the server before this started to happen. I would do the following steps to troubleshoot this problem.
1. Verify that the System Event Notification service is running and set to Automatic Start.
2. Install a virus protection software to scan the server. Make sure the system is clean.
3. Test by starting the server in Clean Boot mode
4. run sfc /scannow to scan the system files.
