PC randomly freezing with a buzzing sound.  This usually lasts about 4 or 5 seconds and then my screens go blank and come back and then all is fine.  A few times I have had to reboot the machine. I have actually had this happen maybe 10 or 15 times over the last month or so and hadn't been able to pin down what was going on.  I can't find any problems with my hardware or software.  No malware or viruses.  For me it usually happens while streaming from Netflix or Xfinity.   Hadn't really tho