According to a study by mobile application mangement platform Crittercism, iOS apps are twice as likely to crash on the new iPhone 5s as they are when running on the iPhone 5 and 5c, reports AllThingsD. The app crash rates on the iPhone 5s are attributed to the unforseen issues that developers have had transitioning to the new internals of the iPhone 5s, such as rewriting drivers and code for the phone's 64-bit A7 chip and M7 coprocessor. Apple notably began allowing developers to submit 64-bit apps for the iPhone 5s on September 16, just four days before the launch of the device itself.