When I used the browser on my Verizon Xoom, websites would not load. The progress bar went about half-way across the screen and stopped, then completely froze up.
The Xoom tablet stopped working and unresponsive. Pressing the home button but nothing responded. The battery was at around 85% last.
To fix the issue, Pressing down the power and the volume up button for 3 seconds and it will "Hard Boot" the Xoom tablet. Works for me.