Error 502 on my website

Throughout the day, periodically pops up
there is such an error on the subdomain http://prntscr.com/1258p03

https://support.cloudflare.com/hc/en-us/articles/115003011431-Troubleshooting-Cloudflare-5XX-errors#:~:text=An%20HTTP%20502%20or%20504,with%20your%20origin%20web%20server.

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