I'm having a problem on both my iPhone 6 and my iPad 4 since upgrading to iOS 10 in that some notifications won't go away. For mail, if I read the message via the notification, it's fine and clears normally. If I happen to read the email in the app directly (not through the notification) or on my PC, sometimes the notification clears as it always has. Other times, I may have read or even deleted the message, but the notification won't disappear on its own and won't clear when I hit clear. Likewise, other notifications like Starbucks or news will sometimes clear fine when I hit clear and other times hitting clear does nothing. In either case, I can get rid of them by either clearing the entire day or by rebooting. Anyone else hitting this? I couldn't find it in the forums doing a search, but it's certainly possible I missed it as there are a lot of topics on notifications. I've done a hard reset and, while that does clear the problem just like a regular reboot, it doesn't fix anything permanently. These are GMail accounts if that is significant.