I'm having text notification sound issues since upgrading to 5.0.1. While texting with a contact, if they reply and I still have the conversation window open, the phone doesn't chime or vibrate. I keep missing replies because the phone doesn't notify me of messages. My S4 worked flawlessly until I upgraded to 5.0.1, so I'm guessing this is an OS problem. I'd really like a fix as its incredibly annoying to repeatedly miss texts because of the lack of notification. I'm using the stock messaging app and from what I can find on-line this is now considered normal operation under 5.0.1. I'm not sure who made that determination, but I can tell you that it is not what most of us would consider normal operation. Please file this as a complaint and bring back the notifications.