Screen locked wants password to power off or turn on

My tab A SM-T550 suddenly is asking for a password after I swipe screen. If I try to power down it wants a password to do that. I think I have to factory reset and lose what isn't on the sd card, but none of the hold power/volume down, then power//volume up seems to work

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sometimes holding the power button for longer will turn it off, failing that you could disconnect and the reconnect the battery

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