520 error intermittently bringing site down

I keep getting an intermittent 520 error. My host has been looking in to it, they’ve asked if Cloudflare can see if everything there end is OK or if they can provide me logs so that they can investigate further. I emailed Cloudflare but they just emailed explaining what a 520 error was and marked the case as resolved… So, I was wondering if anybody here can offer any advice ?
Thanks
Andrew

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