From a few days ago, my 3rd Generation iPad under iOS8.4 (12H143) has stopped automatically syncing Calendars and Contacts. Other things may also have stopped but I haven't checked anything else. I back-up to iCloud every night and via iTunes to my iMac once a week. I generally use wifi but occasionally 3G if there is no wifi signal when out and about. In the case of Calendars I first noticed several days ago that syncing wasn't "immediate" and could take an hour or more. Today I notice that changes I made to Calendar on my Yosemite iMac still haven't appeared on the iPad after four days. An event I added to the iPad an hour ago is not reflected on the iMac. "I haven't changed anything, honestly I haven't, mate!". OK, OK, I used to do mainframe IT support so let me rephrase that oft repeated yet always false assertion to reflect the truth - I am not aware of doing anything which would explain this seeming divorce between the two devices. One thing I have just noticed, and I can offer no explanation as to how or when it changed, is that on the iPad under iCloud the option of iCloud Drive was switched on whereas I always thought that it was off. I can only assume that the Grandchildren (who may well be taken outside and shot if found guilty) turned that on when playing but, as I haven't seen them for a couple of weeks I'm not convinced that that is the culprit. I have, however, turned on that option on the iMac as well. No change! I have turned the iPad and iMac off and on again - no improvement. I haven't, I confess, done a reset of the iPad as since iOS8 that seems to re-download thousands of emails from the servers of my ISP but, if that is the only solution, I shall grit my teeth and do it. Any advice would be very much appreciated - properly syncing Calendars are necessary to rule my otherwise chaotic life!