I've noticed that i have a few trusted places, etc. setup and yet it doesn't stay unlocked.
Ok good to know.I had the same problem. For me it was a GPS issue. Rebooting the phone fixed the problem.
I use my phone all the time lol.I use mine mostly with my smartwatch as a trusted device so don't get many chances to see if my trusted places work all the time. When it doesn't work for you is it after a short time or long time since you last used the phone? The reason I ask is because Smart Lock only works if you've used the phone within the last 4 hours then you have to use a pin to start over. This happens to me every morning when I get up and have to start the say using a pin code