when I'm in my realms server it randomly kicks me and says removed by operator

I've been playing on this realm owned by a friend for a while, and for some reason I'm being randomly kicked, when I get kicked it says I was "removed by operator" this issue occurred once before but was resolved when I was banned and unbanned from the realm, it is happening again and nothing seems to work. I would really appreciate it if you could help me resolve this issue.