While using skype for a while the Mac mini we are running decides to crash then restart. We are running Yosemite and the newest version of skype. We aren't sure if it's skype or the operating system. But while we are in video chat. The video freezes and then craps out to a grey screen then an apple symbol and a loading bar. Half way through loading the computer restarts and when we try skype again it does it once again. Please if you have any help on the issue get back to me. Thank you