I have been a bunch of crash reports and have pinpointed that the reason for these crashes are because of the version of the iPhone is iOS 7 and below. Is there a way to replicate the version or change the version on the simulator?
In Xcode preferences -> Downloads
You'll find the components list, in which you can download iOS 7.1 simulator.
The older simulators runtimes are not compatible with the new CoreSimulator architecture. That means that if you want to test in older versions (7.0, 6.0 for example) you will need to downgrade your XCode.
Hope it Helps.