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Application not starting anymore

So I build my vuforia project in unity, build an x-code project, and build it to my iphone and ipad as a developer. Now after 2-3 months open the same application it doesn't get past the splash screen before crashing. This has now happened with every single project I've built, what is going on? Is it because I'm buildng it to mhy phone as a developer? Or is there something I'm doing wrong.