Realm crash

I download some addons on to my realm which I removed later on. ever since then my realm has begun crashing and been getting worse. It would crash as often as ever 1-2 mins now. Making the realm next to unplayable. It's been frustrating having put work in our build only to have the realm crash sending us back up 2 hours worth of work. I would appreciate it if this could be solved. I enjoy this game very much so I would be very grateful for a solution