A Reddit thread about a sharp crawl drop prompted guidance from Google’s John Mueller. Here’s how to diagnose the cause.

• Sudden crawl drops are more consistent with 429/500/503 responses or timeouts than with 404s.
• Once issues are fixed, crawl rates should recover, though it can take time.
• There’s no defined timeline for recovery.

https://www.searchenginejournal.com/googlebot-crawl-slump-mueller-points-to-server-errors/553715/