Intermittent Failure to connect Realm

Hello,

I have a very strange issue when load a Realm:

Username: MoneyMattMatt 

Realm: KermitCraft

Most of the time it works perfectly fine. Then sometimes while playing I get kicked out and cannot rejoin again. During the "Loading Terrain" phase, the terrain is not created (or half created) and after a while I get a connection lost error.

I have recreated this issue on different laptops.

I'm using my home wifi and during the issue internet access is still working fine. 

Thanks