My system install windows 10. because my board when monitor in power save will make system crash.
so I had disable all power save feature.
I didn't running any program, only system running.
system can stand 6~22 hour, never longer than 24 hour.
I guess my board's quality is not good enough.

Based on report from Jaguarboard members, there is HDMI incompatibility issue with some monitor, I am not sure if your monitor is the one.
Can you try to set a static IP, then ping it when you think it is "dead".

Or can you try to run Fedora Server or other linux system?

I pretty sure the system is crash. I had install teamviewer, when system crash, I can see the board is dead.
Sometimes screen still showing desktop,mouse keyboard without any respond,
Sometimes some LED is all off or on and stop blinking.

Can you try to run linux system? Fedora server?
If it is hardware issue, it will be dead after some hours with linux system, right?

maybe, I will try to test linux later.
If Jaguarboad can running windows system more stable . I will like to have more Jaguarboad in my test lab.

Win10 is running very stable on my desk, and so do many jaguarboard members. I just wonder if because of some incompatibility factors , so i need you to confirm the hardware with linux system, i suggest fedora server.