I’ve only had this a handful of times. There also doesn’t seem to any consistent way to reproduce the error.
I have existing pages that are all rending fine in the builder however in the front end of the site it is as though none of the styles have pulled through. As the site is in development there is no caching.
The first time this happened was after i added 3 icon elements into a column. When I removed the elements things started working again. That said after removing the icons I added them back again and then the page was still fine.
It is now happening again although on this page I haven’t done anything specific. I just noticed it as I was going through all the pages on the front-end.
There are no errors etc. that I can see so not sure what is going on.