After this happened the 1st time, I check the "Update Driver" from Device Manager, and it said I already had the "best" driver installed for my device. I have disabled "Allow computer to turn off this device to save battery" from the Power Management tab, and haven't seen it happen for some time, but it started again. I downloaded the latest driver and installed it now, I will use the laptop for some time and see what happens. Honestly, I don't want to go through warranty and all that if it's just a software problem. I'll keep you updated, and if someone had this same problem, please post about it. Thanks for your ideas.