I lock my PC and go away for a few minutes, whenever i come back it's restarted?

[AzuraD]

This has been happening for the past few weeks and i have no clue how to solve it.

I lock my PC and go to make food or something, I come back and log in, and find out it's done a full restart since I've been gone, and it does this every time.

Is there any solution for this as it's driving me up the wall.

OS: Windows 10 Pro 64-bit Insider Preview Build 14271
Specs:
AMD FX-8350
ASUS Nvidia GTX 950
ASUS M5-A97 v2.0
Corsair CX600M

 

[Ralston18]

How are you locking your PC and how do you know that a full restart has occured?

You can look in the Event Viewer logs for events, errors, and warnings that happen after your "lock".

However, it is a Preview Build and such things are likely to happen without reason/cause. Check online via Microsoft Support - see if anyone else has reported the problem.