502 Bad Gateway intermittently

i have a blue iris web server running on my lan. I have setup Cloudflare tunnel to access from the internet. It works fine 99.99% of time. However, we are using Uptimerobo to monitor the web server access and it reports a 502 bad gateway intermittently - 3-4 times in a 24 hour period. It only lasts for 1-2 minutes. I Don’t think the web server is down as we have a ping test running from Uptimerobot and it never fails. Not sure if it;s a webserver issue or cloudflare dns issue?

Timing sounds like it may be related to this

Still getting the 502 error as of 10 minutes ago – 4:23 Denver Time

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