My SSL certificate is fine, but why is there an access problem with the website

When I entered my website today, it prompted a privacy error, telling me that there was a risk, and after I chose to continue to enter, the HTTPS of the website appeared with a red bar indicating the risk, and many functions of the website could not be used, and the front-end error was reported, and the access speed was extremely slow. Can you help to check what the problem is, thank you.
The Edge browser prompts a risky prompt that "This server cannot prove that it is lingyun-weibo.free.nf; Your computer’s operating system doesn’t trust its security certificates. This could be caused by a misconfiguration or an attacker intercepting your connection. ”

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But now it’s back to normal, and I’m sorry to bother you

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