Hello! My first post to the forum, so apologies for any protocol violations. I upgraded to an iPhone 5s (iOS version 7.0.4) last week, and am having a problem. Very occasionally, perhaps about once every 10 times, when I send a new text message to one of my contacts, the moment the text message sends, my contact is deleted. Just that one contact. I have seen threads about the entire contact list deleting. This is not the same. For example, if I select John Doe from my contact list and compose a new text to him, it says John Doe at the top of the text message. I hit send, and the moment it sends, John Doe's name disappears and is replaced by his phone number, such as 813-123-4546. Then when I go back into my contacts list, John Doe no longer exists. He has been deleted. This does not happen every time. Rarely, in fact. But when it does it's quite a pain to retrieve the contact info and re-input. I've tried to identify a pattern for when this happens, but so far I cannot identify anything. I called Apple Support and they couldn't offer any valuable options. They got stuck trying to change my settings, and it's hard to believe this could be a setting since it occurs so infrequently. Feels like a quirky little bug. Thanks to anyone who can assist.