It may be possible that there is something with chrome and your webpage that is occasionally causing a conflict.
Unfortunately its hard to say what this might be, and it may be something that other browsers do not have a problem with.
However I would recommend running your site through http://www.websiteoptimization.com/services/analyze/
and see if any issues are noted.
This is a general analyzer, however any potential issues it shows may point to possible reasons why chrome is having issues.