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Once you wanna use the fingerprint sensor you should set you fingerprints. Go to Settings-Security. Set the PIN method for Lockscreen and add your fingerprints in Fingerprint Manager. Now while on the Lock screen you can choose either to unlock it with a finger or pin code.
Hey there. This is common for many Xperia Z5/Z5C & Z5P users since the update to marshmallow 6.0. I'm told we are due an upgrade to 6.0.1 by the end of April beginning of May. I would hope that Sony have addressed the issue then with the problem being fairly common within users of these devices following the update. Hope this puts your mind slightly more at ease.
It is allways a good idea (and sometimes it is necessary) to restart or turn off/turn on your Xperia after updating.
Your Xperia need to be restarted frequently.
I do a restart every second, third or fourth day.