Attempting to join my friends realm with a stable internet connection and it keeps saying I have an unstable internet connection.

Ever since me and my friends got version 1.16.100 our realm was experiencing tons of lag like mobs model stopped moving but we would get hit by invisible mobs, we would need to eat food over 5 times for it to register, mining blocks was unbearable and took several times, until finally the day 1.16.200 was released. Right before the update was released our realm kicked all of us out and kept saying the same message in the picture below, "Unstable internet connection" and other times saying "Unable to connect to world". We all have stable internet connections, we all redownloaded Minecraft, and the realm owner even reset the realm and it still doesn't work. This is especially annoying because our realm has limited time left and this issue is wasting our time that we all pitched in to pay for. Thank you for your time and I hope you can find a fix soon.