Intermittent ERR_SSL_PROTOCOL_ERROR on custom domain — random pages, no pattern

Domain: palikoapp.com (and www.palikoapp.com)
Plan: Pro
Framework: Next.js 16, App Router

Browser shows “This site can’t provide a secure connection” / ERR_SSL_PROTOCOL_ERROR. Happens randomly… not tied to a specific page or route, happens on both fresh navigation and refresh. No pattern I can identify in terms of frequency or trigger.

What I’ve checked:

  • Domains tab in the Vercel dashboard shows “Valid Configuration” with no warnings
  • DNS records haven’t been changed recently
  • Issue reproduces across desktop using chrome / mobile using safari and chrome

I’m seeing the same intermittent symptom on a second, unrelated site also hosted on Vercel, which makes me think this may be an edge-network-side issue rather than something specific to my domain’s DNS/cert configuration.

Happy to provide cert IDs, run openssl s_client diagnostics against specific edge IPs, or any other debugging info that would help narrow this down.