You didn't say what you have tried, but if you go into the control panel, select > Power Options, ithen n the left side panel > "Choose when to turn off the dispaly." Adjust the setting according to using the battery or plugged in. You can also pick "Change when the computer sleeps" and make adjusments there.
Another thing you can be aware of is the life of the battery. If it is low, it will shut down also.
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