Hi @dale
Sorry to hear this. What does the EAC untrusted error message say specifically?
We have a few solutions to untrusted error messages in this article:
Please give these a go if they are relevant 
@dale, glad to hear the EAC error was resolved.
Are any specific errors displayed on-screen when you drop out of games?
I recommend running through our Connectivity error solutions here:
Sorry to hear that 
We’re currently looking into similar connectivity error reports (primarily SSL and Lost Connection to Host errors). We haven’t uncovered any issues our side yet, but this is still very much under investigation.
It’s a shot in the dark, but in case of a local data issue, you could try a clean re-installation:
devtrackers.gg