Same thing here. I have a Samsing Duos recently updated OTA to Pie. After factory reseting several times and a lot of work around it it looks like whenever I use the fingerprints to set those as unlock it keeps turning off randomly, usually less tan 5 mins of idle. I am now using it without finigerptrint unlock althogh fingerprints work for login with several apps. Very annoying and thinking of moving forward to another brand.
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