I'm running into a bizaare intermittent issue with Drupal 6. Sometimes forms just fail to submit, and the page reloads with no error messages of anykind. It's almost like someone hit refresh, only all the form data is reset, etc. Basically if you resubmit the same data again a second time it works. Needless to say if you're typing in a new piece of content or a long comment and this happens its quite frustrating.

The behaviour happens on a variety of different forms. It might happen when submitting a form for configuration changes, or it might happen when I am adding or editing a new piece of content.

I can't establish any reall pattern to guarantee reproducing this, and I've tried to find errors in my apache error logs (they're empty via the CPanel interface I have through my hosting provider, which I find suspect). In this hosting provider I've got max memory set to 128M.

Any ideas as to where this problem might lie? Anyone experiencing anything similar?

Dave