Hello @ClementPlaza ,
One of the things you could do to alleviate some of these block issues is to regularly clear your browser's cache once or twice a week. Additionally, copying from an earlier or more direct source (like a master template) can assist with avoiding the junk coding build-up that can occur from copying copies-of-copies. Built-up junk coding can cause a lot of unusual and unwanted behavior, including reversions on text, image, and coloring formatting.
Some of the issues you're experiencing also sound connectivity-based. Whether it's an issue of a lot of content in your email causing increased bandwidth usage for autosave and displaying/editing, ad/pop-up block or browser extension interference, or a combination of several factors, it may be worth performing some basic connectivity troubleshooting, or adding additional Read More / redirect links in your email to reduce the amount of content and overall lag.
See also:
Connectivity Troubleshooting FAQ
Email Length Best Practices
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William A
Community & Social Media Support
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