Cloudflare suddenly stopped caching my site

It happened in the middle of the night, I woke up and found that Cloudflare stopped caching all the content of my website,
(CF-Cache-Status: DYNAMIC, including jpg)
The server crashes due to excessive load,
So I’m sure I haven’t changed any settings, and rechecked that all settings are ok,
I immediately 302 my site to another domain, the cache is temporarily back to normal, working on another domain
I’m sure what Cloudflare has done, and I’m wondering if Cloudflare decides to stop caching my site for some reason, should I be notified?
But I didn’t receive it, or is this just a bug?

Below is a screenshot, because I have diverted other traffic to another domain name, leaving only “/test*” for testing

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