Ableton Live keeps crashing - why?

Ableton Live crashing could be a number of things, Ableton does have a good troubleshooting guide you can check out here. 

If Ableton Live is performing slowly, this article may help.

Some other more common things to try are disconnecting all usb or other connections, bypass the VST plugin scanning, and try opening a blank Ableton live set and open Sunday Keys for Ableton or a different project from that.