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Re: Screen won't auto lock
I suspect its more likely you have an app that is installed that doesn't let your system sleep, and may always be running in the background. Its could be something like your WhatsApp that is not a standard app on the system.
Originally Posted by Goliath_online
Do you have developer mode setup on your system, or some other app that reports what apps are actively running on your system, and how much resources and time they are active? If not enable developer mode and go into the process stats area under developer options. That will tell you what is using how many resources, and how long it has been active. If there are any apps listed that you never use, and never plan to use go into app management and set them to disabled (or remove them if that option is available). Ones you use occasionally, but don't want running at the time you can force stop. After stopping, disabling, or uninstalling the apps you don't need running ( even if just temporarily while you test) see if your screen locks normally. If that fixes the problem you can go back and re-enable the apps one by one and test again to find which one was causing the problem.
I have my system set to Auto Sleep for Screen Timeout, and Lock phone after (under Security) set to Immediately. With those settings the lock screen appear every time the phone is waken. You can give it a test with those settings, and see if it brings up the lock screen every time it wakes up for you too (which it should do).
I don't think the magnet is the cause, but you should still keep magnets away from your systems as they can ruin your hardware, and warp the display on your screen.