So about this error, I just found something out on this topic wich might help Mojangs team overcomming this anoying issue in everyone.

The thing is, when i play realms and i started to find something interesting, is that the closer i am to the reset spawn point the more crashes i have, and the further i am the less i have... with almost a thousand blocks apart it's totally ok with zero crashes... and sometimes what happens is that when i die and if there are other players online, they must disconect so that normally i don't have the crash... seems like it's when i am close respawning to other players as well i have them... 

Yes this is the best way i figured this out throught three months of trying to find a way to overcome this problem. So, it's not the DOS, the flush, DNS, or whatever problem many people say it was... sure it may help from time to time, but the problem will keep comming up as it did to me!

Thanks for your good work!