Blank homepage

Hi, i’m suffering again (had this issue earlier from time to time) from blank pages (my homepage).
Checking several computers, laptops, smartphones and several browsers give no result.
Changing the theme works fine, which suggests or better, is the proof to me that Enfold is the cause.
The problem is not consistent, for instance i have a blank page 15 minutes ago, but it can be solved within 15 minutes, 2 hours,…
How to solve this?
Thank you