Hope Coakes

I have had exactly the same problem only started yesterday with me too. running second life then after about 15 to 20 minutes my whole pc freezes up and I have to switch it off as I am unable to do anything even shut down. pressing ctrl /alt /del doesn't bring up the task manager. My pc is more than capable of running second life, and I have been playing it for years with no problem, until yesterday. nothing else on my computer freezes it so it must be SL. is it a bug?