mail.app, gmail imap and DRAFTS

Mail.app 3.2 save drafts quite often as I am typing, however it does not replace or delete the draft already saved. instead it makes a new copy every x number of seconds, and I end up with multiple email drafts in the drafts folder. The drafts do not disappear when the email is sent, and they remain in the Gmail Drafts folder until I manually go in there and select the tens or hundreds of drafts and delete them all by hand.

Any solution to this problem?

-Kris