Hi mylkrex,
What version of the Engine are you using, and are you using an Engine built from source code, or using the Launcher? When the Editor crashes, do you see the crash report tool? If so, can you copy the callstack that it provides and paste it here? Also, if you can provide the most recent log for your project when it crashes, that would be great. You can find the logs at \Saved\Logs.
Also, please take a look at this post to get an idea of any other information you may have that would help us investigate this issue.