Realms work for a short time then say unavalible and i have to pay for a new realm if i want to get it to work, also trying to replace the realm does not work.

When i go to join my realm it loads for about 5 minutes then says try again later or try your internet connection and there is nothing wrong with my connection so i wait till later and it is still giving me the same issues. Or say i try to replace the world with a copy it says error unavalible.