It’s the state of the art for Apple. It’s their most advanced mobile device available to their fans. The iPhone 5S is also crashing more than any other iPhone ever… a lot more.
It is definitely not surprising to notice app crashes, particularly after a major OS update. Such app crashes usually occur at a higher rate than usual, but then as subsequent incremental updates come, the bugs are ironed out and the frequency falls down. App management platform Crittercism makes an interesting observation about the iPhone 5s, that apps on iPhone 5s are crashing twice as often as they would on iPhone 5c and the iPhone 5. Crashes on the iPhone 5s are noted at two percent as compared to one percent on the plastic and last year’s iPhone.