Made a full wipe and restored via DFU 2 days ago. Did not help me at all. First time after fingerprint re-add it worked even with dirty fingers and dirty sensor. Then i just left the phone on a table for some time, came back, and OH A MIRACLE!! It stopped working again. Cleaning sensor helps for some time and then the story repeats.
I tryed not to press the button, just wake the device with power button and slightly put the finger to unlock via TID, to do a minimal mechanical interaction with the button( thought maybe the sensor lags and comes alive after a button press shake) but no result! It can work, and after five minutes it doesnt! And than again...
After updating to 7.0.4 cleaned the sensor and re-added the print. Worked as a charm five minutes ago even with wet fingers, and now it fails again!
Maybe the feature, that automatically "learns" better your prints while using TID is working in background, when phone is locked??? And spoiling the performance...
Noticed a rule, that the scaner starts failing more often after just leaving the phone on a table.
You lucky guys with all your apple stores and other stuff. In my country I cant just go and replace the phone...
I still believe, that its a software issue... APPLE , please fix it!!