Connection lost when using Page Builder

HI,

I am running a wordpress site using Edge Theme.
Every time i am using Page builder to create my page, it show connection lost. if no, it will also can’t be saved or published.
I tried to loop my post in same category on a page. or create a page with button. both were failed with tried many time. It’s because the theme i am using is not suitable for site origin?

Thank you.

Regard,
koid