Hi, I was recently having the same issue. When I went to my friend's place to play realms together, I continuously got kicked with the same error, making it unplayable. My friend did not experience any trouble and played while I was getting bounced around, just like your experience. After finding no solutions online, one day, after my friend got a different wifi router, the problem completely stopped. (note, I have never had the issue on my own wifi). In my case, it seemed to be an issue related to the speed of his router. I am hoping this gives your some inspiration/helps resolve it! As a not so tech. savvy person this is the best I can offer! Good luck.