Why My project on Gear VR sometimes failed,sometimes run?

I build a base level which uses first person template , then package it to test on my Gear VR. Everything goes well, until I click the app icon on my smart phone(Samsung S7). Sometimes it just failed to run, and can not get response later, sometimes the level is fine, so I can see my level.

I do stuffs according to “Samsung Gear VR best practices” page, but it still can not solve my problem.

Anyone could help ?