Our Nuki Smart Lock version 2 behaves very weird since 3 weeks as it freezes occasionally without any obvious reason. It LED stops blinking and the lock does not respond anymore. This is very annoying as you need to have a key with you all the time.
After removing and replugging the batteries for a while the Lock works as usual for a period of time, which is between a bunch of hours and some days.
The current firmware version is 2.11.9 and we are using it with a Bridge.