I have had 3 times where we killed the boss and just before I can loot, there's a host migration and I am locked out of loot. Usually this happen during share sessions and thanks to the boss timer, I am now locked out. It's not always possible to log in after 3 hours, in weekdays I only get to log in once.
You can understand how annoying and frustrating it is when this happens. Please add either a mail system like Warframe or the historian should collect the reward and we can get it from him.