I only recently downloaded and joined a friend's game this day, and I'm having a lot of issues with the app.
1) I receive the NETWORK ERROR message most times I open the game. I usually have to close the app, then try again.
2) I cannot see communications in the communications window most times. The window simply appears blank. I do receive notifications on messages, and there's a small red number that lists the number of unread messages presumably, so I know there is indeed chat.
3) The "transfer drillers" window closes in less than a second after I drag a sub to a vacant/enemy outpost. This gives me no time to load the sub. Consequently I can't attack at all.
I'm using a HTC One phone, Android. Reinstalling the app and restarting my phone did not help.