Apps No longer Refreshing

Is anyone else noticing issues with apps not refreshing on iOS 7?

Since upgrading, apps like Whatsapp and Kik no longer notify me of any new messages until I open the app

I'm also noticing this with the Message app on the iPhone sometimes I have no notification of a new message.

If I open the message app and go to the message list, it will show a new message has been received in a conversation but wont display the message. if I then open the conversation, eventually the message will appear. often showing a time stamp of 10 or more mins ago