Launching a TestFlight build takes multiple seconds (App Store apps are fine)

NB: This question was originally posted to the Apple Developer Forums (login required).

Problem

I have an iPhone 6 Plus running iOS 8.1.3 (12B466), for the most part it functions as expected. However any apps I install either via TestFlight or build and run on the device with Xcode all take multiple seconds to launch.

The icon will become dark and after 3, 4 or 5(!) seconds the app will launch, occasionally the entire phone will crash during launch. This happends with any app install via TestFlight not just my own apps. Apps installed via the App Store are fine and launch immediately.

I also have an iPhone 6 adn 5S, these launch TestFlight app immediately as expected.

Anybody else having this problem?

Steps taken to resove:

• Reset phone and restored from back up (did not fix)


• Checked the logs (cannot see anything that might be useful)


• Restarted the phone (hundreds of times!!!!)

Other info

The only other thing I have noticed about my iPhone 6 Plus is from within an app calls to UIImagePickerController also take multiple seconds this is true for (at least); my own apps, iMessage, Tweetbot.