Major crashes

Major crashes on any device. From the situation we can know that was high mem using caused. we already crashed for 20 times in 30 mins. 

We didn't find anything would make it crash obviously. Instead, it maybe crash anytime, whether what we are doing. The lag is super major than 1.4.2 version too.

Device: Lumia 950 with Windows Phone 10, any computer with suck processors.