Why I'm continue to have the blue screen of death?

For almost a year, I've been experiencing the dreaded blue screen of death with a unmentionable problem when it restarts automatically on its own. I've been posting here every time it happens and get no response to why it's happening and how to fix it. I did Apple Diagnotics and it came back with no troubles found. I want it to stop! I'm cutting it close on calling Apple for tech support before I go over to the Genius Bar next year. Please help!