on four separate occasions, over about the last two weeks, my computer screen goes all blue and says “your computer is shutting down due to a fatal system error” or something similar to that. then it stays on but i can’t do anything with it, so i shut it off myself and restart it. this only happened these four times. computer is about 5 years old. it’s a dell laptop. i only use it for the internet and email. i don’t want to call the wonderful customer service at Comcast unless i have to.