I'm having the same issues, it got ridiculous Friday night, my singer would do one line and I would immediately save. It was freezing every 10 minutes. Meters would be stuck, no message about sending the crash to Cakewalk would come up. My system would let me alt ctl dlt to get to task manager where I would have to end task on Sonar. But once back to my desktop, I couldn't open Sonar, I would have to do a complete system restart, then repeat the process. Kinda stifles the creative process a bit, and it's so annoying that I'm paying monthly for it and it doesn't work. I'm at work right now, so I don't have all my info, I'm running around 18 tracks, 5 buses and a master bus. I use a Roland Octa-Capture for my interface. One thing I noticed is the Octa-Capture was running at 48000Khz instead of 44100Khz due to the fact that I use an Axe-FxII to do all the guitars and bass, and it runs at 48000Khz. So I was wondering if that could be an issue, I never even knew the Roland could run at that to be honest, unless its picking up on what my settings are in Sonar. At one point, my phantom power kicked off by itself. It was an extremely buggy night. I've never had issues with Sonar Plt until that night trying to track vocals. It has never froze or anything, but now when I go back and mix this project, the line that scrolls acrossed the screen as its playing is jerky, like its a lack of memory or something. But that can't be, I've got a beast of a computer, its a gaming system, 8 core, 2.3 GHZ, 16 mg memory, I can't remember what video card is in it, but it never has issues with anything. I do use Waves plug ins, and I think I may be mixing in a 32 bit in there with the VST3's. I will pull that VST2 32 bit and see if it helps, and check for updates on my drivers. I will also try what meh suggested once I'm home and free to mess about. Sorry about the long drawn out post, I get long winded sometimes.
Wgmj