I have an iPhone 4 and just downloaded iOS 7 yesterday and I noticed earlier today that the control center function has not been working very well. Occasionally it will pop up but 9 times out of 10 it won't, and I have to restart my phone and then try it again, it'll work once and then I'll have to restart again. This also applies to notification center, which I don't care as much about, but this is extremely annoying because I believe control center is the best feature of iOS 7 and it does not work well. I'm thinking something went wrong during the installation process… What are your ideas? Is anyone else having this problem? If so, did you fix it, and if you did, how?