So, Eurogamer released an anolysis of Fallout 4's technical issues across all platforms. I know some people haven;t had a single problem, and I know some people haven't even been able to start the game, but hopefully this article will explain what's really going on and what can be done about it: http://www.eurogamer.net/articles/digitalfoundry-2015-fallout-4-face-off

This article is VERY long, and goes crazy in-depth, but it's still worth a skim-through in my opinion.