intermittent 5xx errors on websites

Hello, some of our users are intermittently presenting 5xx errors when entering our website (520 and 522), we have already checked our server services and talked to our provider but on that side everything is normal, without logs or anything out of the ordinary.
Apart from this, when entering cloudflare we received an alert that something was happening and that they were already reviewing it, but we have not seen an update on this on the status page.