App Crashes After 14min of runtime

Hello, 

I'm using Unity 2017.3.0f3 and Vuforia 7. and im deploying on Ipad Pro 12.9 Inch Model. 

The app is just a sample scene with Image Target. I have one image target with a simple robot downloaded from the assets store. Not using animations or anything else. just Vuforia image target and the robot. and after 14 minutes of app runtime it suddenly crashes Tested 3 times already. I can't figure out why or how because i still didn't add or do anything. I have searched it and people are saying to use Unity version 5.3 however such posts are 2 years old and i don't trust them anymore. Any help is appreciated. Thanks