Have had about 8 or more over 3 weeks. This last time I was leaning back in my chair and reading a thread on this forum and BAM, black screen, reboot, and all opened up to where I was. Not fun! I sent to Apple the details. I cannot help but wonder what could possibly be causing this. Computer is running cool, 295s, i5, 512 SSD. Is otherwise fine. Anyone else have this?