Since I've updated my HTC One S to latest 2.31 release, I've noticed that when I leave my screen off for a few hours and then finally turn it back on and get all my emails for the last couple of hours all at once. It seems like there's something sleeping/killing data whenever the screen is off. It's very annoying. Let me be a bit more specific, because there are some cases where data works while the screen is off. For example, if I start a download through Chrome, the download will finish with the screen off. However, it seems like nothing "push" works while the screen is off. I don't get any notifications for Gmail, Exchange, Facebook, etc. unless the screen is on. I think that it could be related to the last Radio firmware upgrade included in the RUU 2.31 release.