+1 - we need to know:
What version of Windows, and what maintenance level of Windows?
32/64 bit Windows?
32/64-bit Sonar?
CPU and memory?
Sample Rate for your audio interface? ASIO Buffer Size? Dedicated interface or on-board sound card?
Sample Rate in Sonar?
If external audio interface, is it plugged into USB 2? USB 3? Firewire? Precisely what make/model interface? Precisely what driver version?
And lastly, as much detail on what happens when it crashes. One particular project? Any project? Any particular plugins used? Anything else you can think of.
This is probably a solvable issue, as this behavior is not happening to a bunch of folks, so with enough diagnostic information, we should be able to get you past this. I will certainly give it my best shot in helping you, and others in the forum will, as well.
Bob Bone