He got homesick, I'm pretty sure. It happens.
Yeah, the drinking rumour I always thought might be overdoing it. He's a regular Norwegian international, as said, and Europa-level player - he's hardly going to come straight in and turn up hammered to training for his first week. It would take a while to eke that out, and if he was, why didn't the black box detect it?
Falque also could have been a problem of attitude - a player who feels he is better than a drop down to the Championship? Pure guesswork, but are countless variables with football players.