If your server logs show frequent, incomplete crawls or bots abandoning pages halfway, you might have "cracked lips syndrome." Real causes include:
– Google runs thousands of experimental crawlers. Occasionally, a test instance with a non-standard version number escapes into the wild for a few hours before being recalled. google search bot version 3.2.5 cracked lips
– Google publishes verified crawler user agents. Compare yours. If your server logs show frequent, incomplete crawls