Having an issue with playing games offline

I have no internet access at my house and can only access the internet when I go into town. A few days ago I downloaded Dragon age origins and played for a short while with no issues. Later, at my house and disconnected from the internet I logged into origin offline mode and played Dragon age origins again with no issue.

The next day when I tried to play offline it said I had to activate my game and could not play it until I did. I couldn't activate it due to lack of online access at the time so the next day when I was in town I hooked it up to the internet and the game loaded with no issues, it did not ask me to activate it. That night when I was offline it wanted me to activate it again. The next day I managed to bring up the activation screen by disconnecting from the internet, attempting to boot the game, then reconnecting when the activation screen popped up. It said I had activated my game sucessfully and I had no issues with playing it offline later that night but now it's bringing up the activation screen again when I try to play offline. The box art has also disappeared and been replaced by the origin logo and it says I have played for 0 hours.

Any ways to resolve this issue would be greatly appreciated as I only use games to kill time when I can't get online.