Google Sync Error on Windows Mobile Smartphone

Google Sync is working fine (so far) with my iPhone. And, I thought it was working ok with my HTC Vox (Windows Mobile Standard Edition). However, it is not working ok with the Vox today. ActiveSync reports 108 calendar items need syncing (seems a bit high since it synced ok just a day or two ago) and then fails after syncing exactly 44 items during each attempt..

The support code reported is: 0x80004005