Did anyone else get separated with their friend by TFT?

Are you talking about how whenever someone loses they get kicked from the party? Yeah that happens. I think it was just a dev oversight from Riot. The game always offers a quick exit so you can start a new TFT when you lose. Unfortunately you can't do that while also partied with someone still playing. So you're automatically kicked to give you the chance to hop into a new game. I imagine Riot will put out a fix for it soon where the game doesn't automatically kick party members when one of them is still playing.