There is a constant issue with the app losing connection with the lock. I may send the lock back. Not sure yet, it seems to work ok unless you're trying to unlock it. I could see me getting pissed trying to get the lock to open while the app keeps saying "connection lost" while im right next to the lock. Or "scan device" for 5 min. Seems the only way to fix it is to uninstall the app and reinstall. Update. The auto unlock feature seems to work ok. I lock the lock put phone about 200ft away go back to lock and it is in fact locked, then, when i walk up with phone it auto unlocks like it should. No fuss. Nice... HOWEVER, when i go to open the app RIGHT AFTER the phone unlocked the lock i still get "connection lost".
I'm having the same issue that Christopher is having. I have tried the SLBLOCK app, same outcome. Finding the inconsistency annoying, hoping there is a solution. Nexus 6P running Android 8.0.
Smart Screen Lock is worlds best and Secure Lock Screen.