Windows goes to lock screen during game play

[Joshwatt98]

hi all, recently during gameplay it happens on fallout 4 iv noticed but i think its happened on a few other games too, anyways the problem is that whilst im playing my games (still actively using the PC) at random points the computer will just go to lock screen as if i have left it for a certain amount of time i havn't changed my settings i think they are on dont lock but not to sure but this happens when i play games i dont know what the issue is everything is working fine nd correctly and everything is installed correctly its almost asif i locked the pc myself but i didnt

 

[jasonkaler]

There is a key combination: Windows key + L that locks the pc.
are you sure you're not pressing that by accident?