I have the HTC One m8 and I use the Verizon Message app. It seems like every time the app updates a new problem arises. Recently I have been finding sometimes my messages will never go from sending to sent even though I have gotten a response, when it does this the recipient is getting multiples of the same message. I clear the cache and sometimes that works and other times it doesn't and I end up having to restart my phone. Also sometimes my phone will receive a message but never give me a notification, or the notification sound will happen and the message will automatically mark itself as read even if I haven't picked up the phone yet. This is very frustrating please help!!