Tbh the way Channel 7 reported on it was not exactly an example of good journalism. “Breaking News - serious indecent with VA flight crew in Fiji - however we have no details on what exactly went on except it’s pretty serious!”
That kind of “reporting” only leads to speculation on forums like this. If they know crew have been confined to hotel rooms and family members are being flown to Fiji then they must know something about the underlying cause if not the specific details.