When 30 seconds in the realms i crash

Hey Helper,

Ok so here's my issue

Whenever im on my brothers realm and when im like playind for 30 seconds i crash
It says ''Internal Exception: java.io.IOException: An existing connection was forcibly closed by the remote host''

I really dont know what to do other than restart minecraft what doesnt work and jsut rejoin but then it just crashes again

And its definitly not my wifi because my brother the one on the realms isnt having any issues

Thanks for listening and hope u guys respond ^-

 

Kind regards,
Gilian