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Sometimes I've noticed that the Smart Lock - Trusted Face feature doesn't work, no matter what the lighting or the position of my face relative to the phone.

I thought that an "Improve face matching" should do the trick, but when I go to do that, I get this:

Android Lollipop - Improve face matching
Click for full size

Usually a restart fixes things, but this isn't a really good solution. The camera app works normally even when this happens. Has someone found a way to fix this somehow, or should I just wait for the next update from Google?

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    There is a possibility that there is an app that is still running and using the camera, and hasn't released the resource (resource leak). You probably need to check 3rd-party apps that use camera and make sure they are closed properly. – Andrew T. Dec 5 '14 at 12:19
  • I thought of that, but since the Google camera app, Instagram etc. work normally, I don't think that's the case. – Rick Sanchez Dec 5 '14 at 12:22
  • How did you upgrade to 5.0, through OTA? If yes, did you do it after a factory reset? – Vishnu Prasad Kallummel Dec 17 '14 at 8:01
  • @VishnuPrasadKallummel Yes, through OTA. No, no factory reset just prior to updating, neither after. – Rick Sanchez Dec 17 '14 at 8:51
  • Ok, I think a factory reset would do the trick, as I have 5.0.1 and the face unlock is working fine. By the way, how are you getting the battery percentage on the battery icon? – Vishnu Prasad Kallummel Dec 17 '14 at 9:03
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I believe that this is an issue with the Smart Lock app itself. When I enabled the face unlock I started getting this error. The camera ceases to work after some time, when I notice that the smart lock icon just blinks on the lock screen (which shows a failed attempt to access camera). Then neither the camera app works nor can I access the camera via Smart Lock settings. I started having this issue whenever I enabled face recognition and I stopped having this issue altogether when I disabled the said feature.

It's a shame that despite being an extremely efficient and fast feature, this causes such a problem that it needs to be disabled.

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