Mobility 18.1.1 483 - Saves duplicate draft emails

I'm seeing this from some Android devices, as well as Windows 10 mail. As an email is composed, every pause in typing creates another duplicate draft email in "Work in Progress" - and when the email is eventually sent those duplicates remain. I have users with thousands of emails in "Work in Progress" - all duplicates of sent mails. I thought there was a way to disable syncing drafts, but I can't locate the setting in the documentation. I would prefer not to disable draft syncing but with this problem I don't see another choice, unless this is a known issue that's slated to be fixed.