Website Showing Random 502 Error After DNS Changes

after updating DNS settings on my OVHCloud hosting the website started showing random 502 Bad Gateway errors several times a day. Sometimes the site cnc machining service works normally and then suddenly becomes inaccessible for a few minutes before recovering automatically. I already checked the DNS records and hosting status but could not find the exact cause. Has anyone experienced a similar issue or knows what should be checked next?

Hello, what is the website address ?