In 2015, Vancouver Whitecaps players were continuously lauding their great dressing room atmosphere. As the disappointing 2016 season marched on, that tune changed. Not that it was a poor dressing room, but no longer was it continually discussed in the media. A bit of an aside, but I think that the retirement of Kah was felt more in the dressing room than on the field.
While unable to be substantiated completely, there were rumors that the locker room was divided between those from Latin/Central America and not. I don't think that was the root of the issue, but it probably played a role.