Yes. It has been erratic lately. Sometimes it's on when it should be off, and sometimes it's off when it should be on. I'm hoping that this will be addressed in the next update.
I seemed to notice that my Smart Lock seemed not work at random times. I just thought it was because either my Fitbit did not have a good Bluetooth connection or the Bluetooth connection with my car was not solid.
Well now at least I know that it is an Android problem.