I have a drupal 6 site that will occasionally serve up a 404 error to anonymous users on the home page only. It happens 2 or 3 times a day and I cannot figure out what is causing it. I can clear it by logging in and flushing the cache, or going to site information and re-saving that form.
We are using the mobile tools module which I thought might be conflicting somehow, but I can't find any issues in the issue queue related to this. We are using caching, but it's just standard drupal caching.
I've also tried checking the server logs and watchdog and I can't find anything useful. Does anyone have any ideas?