I've noticed today that many of the contacts I've added over the past year or so, have suddenly deleted! I have no idea why, I didn't restore from a backup or do anything unusual. But it's really upsetting, some of the people I only have the phone number of and no other form of contact. I have checked my iCloud but the contacts there are syncing with my phone, so the deleted ones are also deleted from iCloud. Why has this happened, is it a common problem for anyone else? Is there any way I can get these contacts back? And what can I do to stop it happening again? Note: I have also now noticed that a lot of my old notes I've deleted ages ago have re-appeared! What's going on!?