Memory issue with iPhone 5

I'm building an app for buying and playing audio files and I'm having a problem with memory on the iPhone 5. The app is working fine on iPhone 6 which has the same amount of memory. It is DDR2 on the iPhone 5 and DDR3 on the iPhone 6. So maybe that is why, but I don't know why that would cause it to not work. I'm getting this debug message in xcode Message from debugger: Terminated due to memory issue There is very little that I am doing at Start so I'm not sure why it is crashing at when opened.