Loss GPS and GLITCH CRASH

Good afternoon,

I am using firmware 3.6.12 - for pixhawk cube and two GPS Here2

yesterday I flying my drone and loss of GPS, after a few minutes of flight, the drone lost control and stabilization, eventually my drone crash in the ground. I ask for help to understand why stabilization failed after the loss of GPS. thank

Log download here:
https://drive.google.com/file/d/1R7Fys885NlVVak2Xs60whrdOOtYTZHPa/view?usp=sharing