This is happening to me but not only from browsing. I think it is a larger problem.
In my case, with a Phenom II x6 CPU, I get sudden reboots under several different circumstances: 1. browsing with too many tabs (~30) probably with one or more using java or flash causes immediate reboot. (firefox) 2. browsing with even with only one open tab a flash application may cause immediate reboot. (firefox, adobe flash) 3. compiling with gcc, using "make -j7" (to utilize all six cores) sometimes causes immediate reboot. --Less often if the cpufreq governor is ondemand or conservative. --More often if it is performance. 4. startup, shutdown, or suspend occasionally cause immediate reboot. I haven't tested hibernate and it's difficult to know what happens with regular reboot, but i suspect these may also cause immediate reboot. These reboots are dangerous. Sometimes they cause data corruption in whatever files are in use at the time of reboot. ** Changed in: chromium-browser (Ubuntu) Status: Expired => New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/571377 Title: The whole system suddenly reboots after few hours of browsing. (it shuts down REALLY fast and then boots very slowly) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/571377/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs