I've been dealing with this for while now. Initially, i believe my excessive amount of tabs were a main factor. I've mostly dealt with that, but I still have around 2000, so I will continue to reduce that number. It's often necessary to do a forced reboot. I also found several Youtube related addons which contributed to the problem. I disabled them. For several weeks now, I thought that things taken care of, but today, it happened again. This time, along with the freeze, my monitor also a emitted a loud, constant buzzing sound. Does anyone else experience these Youtube related events?