I really doubt its tampering, that kind of this is a league issue not a team rules issue. Punishment would come from the league office, and teams tamper as much as they can all the time and never voluntarily admit it.
But to be serious enough for a "significant suspension" but not to be fired sure is a strange category.
Its gotta be a personal conduct thing.
Side Note: Woj and his breaking news is starting to get VERY annoying. If you're a reporter, maybe try finding the ACTUAL NEWS (ie, what idoka did) rather than rushing to report what is essentially "he did...something" just for the sake of being first.