The realm keeps rolling back to an old save randomly

Sometimes when playing with my friends on our realm it suddenly kicks us and resets the world to an old save point. It seems to consistently rollback around 30 minutes into the past and we lose some progress but its VERY annoying. This commonly happens when everyone is on the server playing together. We all play on mobile on our realm. This happens Way too often when we play together and this problem is unmotivating me to play. This happens late game and it doesn't occur during early game. Recently it rollback before i fought the ender dragon so i had to fight it twice. Hope this gets fixed! Thanks!