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Hi Mass8, 

I was able to replicate this issue on my Android device(Moto G5, Android 8.1.0). All I did was to enable the battery optimization for Sophos apps. Here are a few screenshots which I managed to gather: 

This happens as the battery optimization of Android kills the Sophos applications because of which, Sophos will not be able to make sure that the device is protected at all times. So it might take a little bit of hit on the battery, but I recommend that you disable battery optimization for Sophos applications. 

To make sure you don't get such warnings, please follow these steps: (Steps might vary depending on the OS) 

1. Go to Settings>Apps & notifications. 

2. Select "Sophos Mobile Control">Battery>Battery optimization. 

3. Set it to not optimized. 

4. Repeat the above steps for "Sophos Mobile Security" application. Sync your device once. 

Hi Mass8, 

I was able to replicate this issue on my Android device(Moto G5, Android 8.1.0). All I did was to enable the battery optimization for Sophos apps. Here are a few screenshots which I managed to gather: 

This happens as the battery optimization of Android kills the Sophos applications because of which, Sophos will not be able to make sure that the device is protected at all times. So it might take a little bit of hit on the battery, but I recommend that you disable battery optimization for Sophos applications. 

To make sure you don't get such warnings, please follow these steps: (Steps might vary depending on the OS) 

1. Go to Settings>Apps & notifications. 

2. Select "Sophos Mobile Control">Battery>Battery optimization. 

3. Set it to not optimized. 

4. Repeat the above steps for "Sophos Mobile Security" application. Sync your device once. 

Ok, i don't have got the Sophos Mobile Control on my phone, and i installed it.

I set not optimize on all sophos app, restart and the problem remain

Attach screen shot

The first is before restart, after restart, the error in sophos, and the last afteri fix the error in sophos

you would think that this will stop the prompt :)

Yes until I restart the phone

same here.