User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:49.0) Gecko/20100101
Firefox/49.0
Build Identifier: 

Problem: Gnome crashes intermittently. Thus far, I have only noticed it while
browsing with any browser. Currently I am using Chromium and Firefox. I cannot
duplicate the crash intentionally, however, it happens every time I browse the
Internet using Chrome or Firefox at some point or another.

Effects: The system freezes for a few seconds, typically less than one minute,
before crashing. When it freezes, I have no control with keyboard or with
pointer or by touchscreen. After a moment, the entire system unfreezes.
Immediately afterward, Gnome's dash and top boar vanish then reappear two or
three times. The browser will vanish, then the screen will go completely blank.
Finally, everything returns to normal function and control. All windows are
open and Gnome is running.

A secondary effect is that Gnome dash and top bar will simply vanish, then
reappear two to three times without affecting the window I am working in
(except that the window will shift left when Gnome dash vanishes).

Computer: Dell Latittude 3148 (2-in-1)
RAM: 4GB
Processor: Intel Core i-3 1.9mhz
OS: Tumbleweed
DE: Gnome 3.22
Extensions: Dash to Dock, Top Icons Plus, User Themes
Shell Theme: Numix Frost
Icon Theme: Numix Square


Reproducible: Sometimes

Steps to Reproduce:
1. Start computer and log in
2. Start browsing with Gnome or Firefox
3. It will happen within a few minutes of starting the browser, but not by my
control.
Actual Results:  
I cannot intentionally reproduce it, but it happens frequently enough to
observe it.


Gnome always restarts after it has crashed and returns to normal.