(Realms) Internal Exception: java.io.IOException: An existing connection was forcibly closed by the remote host

Just renewed my old Realm a little over a week ago, everything worked just as normal until yesterday. When I fist join the game, nothing loads in for a bit, then the world slowly starts rendering in, but still not as far as it should. After about two minutes on average, I am kicked from the realm with the error posted as the summary.
I tried manually opening ports, resetting and turning my router on and off, updating my computer, restarting the game and launcher, and nothing works.
I have a very good, and fairly new (2 years), computer and router for games, and have never had any other issues with my internet via Ethernet connection.
I have two friends that join me on the realm currently, and this issue with the same error is happening to one of them as well.
I just paid for the monthly renewal of the realm, and would really like to be able to actually play on it, so any help would be appreciated