I had my iPhone screen replaced by Apple about a month ago. For the past few weeks I've had an issue where I will open an app and I cannot do anything. Essentially my touch is rendered useless when I attempt to tap anything. This freezing state subsides after about 10 - 20 seconds. However it happens usually once a day (sometimes more) and can be really frustrating as you can imagine. I have restored my iPhone from a backup twice and restored from new twice since this issue arose. The issue has remained. Any ideas? I'm going to Apple on Friday to have them take a look but I'd love some feedback. Thanks.