You might not be aware that on Droidboxes running Android 5.1.1. , Apps downloaded from the Google Play Store do not automatically update, even if you have set auto update in Google Play settings.
So my advice is to visit Google Play on a regular basis and look in "my apps" to see if there are any outstanding updates and download them manually.
I've also noticed that some other non-Play Store apps are affected. For example Mobdro. The current version is 2.0.9. However, versions on my 2 boxes were at 2.0.4 and 2.0.6 respectively. So you need to download and install the latest version to remain current. (Apps like showbox and movie hd do seem to warn if an update is available when you open them).
So my advice is to visit Google Play on a regular basis and look in "my apps" to see if there are any outstanding updates and download them manually.
I've also noticed that some other non-Play Store apps are affected. For example Mobdro. The current version is 2.0.9. However, versions on my 2 boxes were at 2.0.4 and 2.0.6 respectively. So you need to download and install the latest version to remain current. (Apps like showbox and movie hd do seem to warn if an update is available when you open them).