yes, the plugin Health Check helps. for a temp fix, just turn the maintenance on, everything would be fine.
I got the same problem after upgrading to 6.6.
Webpages stop responding added a synced pattern, by click or drag, through post editor. Un-synced patterns is working fine.
Synced patterns also keep loading content in post editor while editing existing posts.
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This reply was modified 1 year, 10 months ago by ikyent.