PE Realm: Server crash when approaching a specific zone

When I'm approaching a specific zone (chunk ?) on my realm, where I am "working" a lot for some times, the realm disconnects me since 1.0.0 launcher.
I have to wait for few minutes before being able to connect again at a previous position.
I've tried in Survival and Creative mode with the same result.
I've tried using Windows 10 and Android launcher with the same result.

It was working as intended with previous beta version.
I've tried reloading a 3 days backup and same thing happens: disconnected.