When I minimize my Minecraft on my own world, it kicks all of the players, and when I'm on a server it boots me off of the server. This bug basically disconnects me from multiplayer, but when I un-minimize it, I can join the server again and invite my friends to my world.
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Thank you for your report!
We're tracking this issue in MCPE-19393, so this ticket is being resolved and linked as a duplicate.
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