Server Error Report

I have 3 domains configuered with Cloudflare and I’m a free happy user. In the last month or so I have received 4 Server Error reports for 1 website only, which I promptly forwared to my hosting provider.
The report states that the errors are issues with the orgin server or network failure, however my hosting provider cannot find any errors in the logs or have any reason to suspect that there are overloads anywhere.
Cloudlfare dashboard does not provide information that I can meaningfully forward to my hosting provider.
Any help would be greatly appreciated.

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