The problem rears its ugly head in the People Hub as well as the related linked contacts from Gmail in addition to the email application itself. Where both cases are concerned, the affected devices remain stuck in a constant state of synchronization, where even being patient as Job would not see it through. The email application might continue the synchronization process, but the app itself closes, resulting in a severe beating on your smartphone’s battery. No idea for the source of this bug, but perhaps the recent update could be the main problem for the constant synchronizing.