Help help: lock screen disabled can't get it to work

[little_green]

when I got up this morning my battery was below 15% so i had a notification telling me battery was low. I had a notification saying something about making charging more efficient so I clicked it (mainly coz i was still half asleep & just wanted it to go away)
anyway long story shot I had a screen lock pin set up. Now when i pres the power button the screen goes to sleep but when i press it again it wakes up & doesnt ask me to input my screen unlock pin.
I have tried to set it up again & it lets me go through the rigmarole but doesnt actually work when i go do it. i think the app in question is either kingroot or purify but i uninstalled purify & it made no differnce.
in kingroot under 3 dots top right - general settings - there is an accelearte charging option, i think it was this that I actived this morning. however i have now deactived it but the issue of the lock screen pin not working still exists.

does anyone have any idea? short of a factory reset & i have no idea how that will affect my phone since its rooted i'm out of ideas.

 

[girolez]

It sounds like you have enabled Samsung's smartlock which automatically bypasses the lock screen security dependant on location and/or network connection etc but we don't know what device you have......

 

[SavageRobot]

I think Smartlock is on all devices either Lollipop or Marshmallow up, but agreed, this would be my guess. Have a look in Settings>Smart Settings and see if you have inadvertently turned on location based smart lock.