XPS13 9360 crashes frequently with Ubuntu 18.10

My XPS13 with Ubuntu 18.10 crashes frequently. After BIOS (Version: 2.10.0 ,2.10.0) update it seemed to be solved but now it's back again. (BIOS Description: This update enhances the stability of Linux operating system.)

It seems to apear when I'm using a lot of different browser windows. (Especially Chrome). Org when I'm hooked on to the AC Adapter, I'm not sure. What to do to find the exact cause?

Thanks in advance,