When tabbing out of Minecraft (when it's on fullscreen) the connection to any server (Realms or otherwise) is interrupted. When to tab back into the game it takes a few seconds for the game to notice that the connection was closed and then it kicks you out
Related issues
duplicates
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Why won't it be fixed?
Thank you for your report!
We're actually already tracking this issue at MCPE-31994, which has been closed as Won't Fix.
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