Hello,
Thanks for the question, I’m very sorry to hear that your blocks disappeared while editing your pages.
Can you provide a little more information about the issue you’re experiencing? For example, what steps are you taking while editing your page before the blocks disappear? Are you referring to the blocks that have been added to your page, or the Block Library?
A couple of general troubleshooting tips to try- make sure that all of your BoldGrid Plugins are up to date by visiting Dashboard -> Updates, and as always be sure to make regular backups of your website to ensure that you can revert to a working version if needed.
I hope this helps!