I was in the middle of paying my insurance when the browser closed on me. Im very frustrated with my device at the moment. Its a great device, but damn!!!
What I find is that the browser uses up a lot of RAM. If you don't have enough free RAM, then the browser will shut down suddenly. Restart should help. Also turn off Flash to make browser run faster.
Just a suggestion......delete all saved wifi names and passwords and reinstall and also reset router if possible. This worked for me during past updates and stopped the "crashing"