Actually yes you're probably right. If I do get a successful unlock and then lock / unlock quickly it's much more reliable. Set the phone down for a couple of minutes and the problem comes backBeen noticing this too.
But it only happens when device falls into deep sleep (?) for me.
Example:
I woke this morning and device been sleep overnight the fingerprint wasn't recognized
When I took a shower and came back the fingerprint wasn't recognized.
However when I unlock it and use the phone for a minute or so the fingerprint starts to work fine again.
Edit: just tried it over and over and it's quite inconsistent whether it's been in deep sleep or not
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