How to disable Windows Defender 'Health Scan'?

This relates to Windows Defender Security Center running under Windows 10, Version 10.0.16299.



Consistently (not sure if it's the same time every day) I come back to my 'running' computer to find that it has restarted. That means that I have lost what was on the screen when I left. I have equated this inconvenience (to say the least) to a "Health Scan" initiated by the Windows Defender Security Center, which shows that it has freshly run for that date.



Under Task Scheduler I regularly disable: "Windows Defender Scheduled Scan, " but it evidently turns itself back on automatically, perhaps at the behest of some Defender or other update.



Is there a way to keep this from happening? Perhaps the utility senses that the computer is inactive, jumps in and does its thing while no one is watching. But restarting Windows, requiring a login, should be beyond the call of this feature. What can be done, save installing a different antivirus program, and turning Windows Defender off?

Thanks for the reply, dalchina. Here's what my screen shows:


...same as yours, except no battery. Funny, perhaps the restart is NOT the fault of a Health Scan. They seemed to be coincidental, all the times that I've looked, but as there is no report as to the time the scan was done, can't tell for sure. What makes me wonder is that I only turned my system on moments ago, saw your reply, checked my own Health screen, and note that supposedly it did a scan already today! In the first couple of minutes! If this is something Windows does on boot or wakeup, then it might not be what's restarting Windows.

Okay, Dalchina,

Here's the results of that scan:



And under Reliability History, I do see unexpected shutdowns every couple of days:



And under Technical Details, this is typical:


Does this suggest anything? Not sure what 'Blue Screen' means there. Same "Code: 10000ea" for each shutdown.

Further, I see this under Event Viewer:



Those are the four instances of restart.