Note
Mojang are working on a fix for this issue
https://twitter.com/MojangStatus/status/1270026327991738372
I can play in my friends server for a good 5-10 minutes and then I disconnect with a message "connection lost internal exception java io ioexception". What I've heard it's a pretty common problem it never accrued to me until now.
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I've been playing on a Realms everyday for the last two weeks. About 15 minutes ago (an hour after the resolution was posted) I tried to log in for the first time today and got the connection error. Possibly related?

It works again for me ! 👍
Thanks

Issue is happening again for me.

This issue has been occurring to me off and on for the past two days on my realm and currently for the past 4 hours. Java 1.16.3.

This has also been occurring to me for a while. Hasn't happened before this.

I have also been experiencing this since I first started attempting to connect today (about 0600 @-0500 GMT, five hours ago now?).
Edit: time.

This has been happening to me since i woke up i cant even close and then open my realm can u fix this plz

Bug is still happening here for me since 11:30pm Eastern American time

Some people are experiencing issues with their Realm right now, please try again later - if the issues persists for longer, please check the Minecraft Help Center - if that does not help, please contact Mojang Studios Support.
We do not track server connection issues like this on the bug tracker. Any further comments will be removed, thank you.
This should be resolved now, please check if it works now, and if it doesn't work within the next two hours, please leave a comment.