Issue: App not working in background on recent Samsung devices
Solution: Do this: (Android 5.*) Apps -> Smart Manager -> Battery -> App optimization -> Cerberus -> Disable battery optimization. (Android 6.0 and later) Settings -> Smart Manager -> Battery -> Select "Detail" in the "App power saving" section -> Scroll down and select Cerberus -> Select "Turn off"
Issue: App not working in background on Huawei devices
Solution: Open the Settings app and put Cerberus in the "protected apps" (apps that can work in background). Also open the Phone Manager app, select "Dropzone management" and enable Cerberus.
Issue: App not working in background on Xiaomi devices
Solution: Follow the instructions in this post: http://xiaomi.eu/community/threads/problem-with-cerberus.19779/#post-157419
Issue: App not working in background on Asus devices
Solution: Settings -> Power management -> Autostart manager -> allow Cerberus.
Issue: App not working in background on other devices
Solution: Check if on your device there are any system settings or apps that might "freeze" the app, block it from auto-starting or make it not work in the background.
Issue: "Block power menu" feature not working on LG devices with Android 5.*
Solution: No solution, sorry. It is a LG bug in the Lollipop update, we can't do anything to fix it on our end.
Issue: "Block power menu" feature not working on OnePlus devices
Solution: No solution, sorry. It is a bug of Oxygen OS 2.1.2 and later versions, we can't do anything to fix it on our end.
Issue: "Block power menu" feature not working on Huawei devices with Android 5 and later
Solution: No solution, sorry. It is a Huawei bug in the Lollipop update, we can't do anything to fix it on our end.