For the past few hours all iMessages i have sent have said "Not Delivered". Despite this all recipients have received them. I'm not sure whats wrong, it happened all of a sudden and after retrying messages multiple times they have said that they're receiving everything i sent. The messages are also not syncing, I can have a conversation on my ipad and those messages will only show up on that device. When i message the same person from my phone or laptop i wont see the previous conversation. I've reset my network settings, turned iMessage off and on, and re signed in to my icloud account but nothing has changed.