Hi- I just wanted to chime in because I was able to resolve a similar issue on my Windows 8 machine recently. I went though all the steps to reduce DPC latency, run LatencyMonitor, use slimdrivers to update all drivers, turn off unneeded processes, etc. with little gain.
I noticed in my application log that I had several "ESENT" alerts that corresponded with the Audio crashes. Most were associated with Windows update , even though I had auto updates turned off.
I disabled the "Windows Update" service in my Computer Management/Services console. I also paused the Windows Indexer under Control panel/Indexing options ( it was another ESENT error culprit ).
I stopped getting the ESENT alerts. It seems that even with AutoUpdate off, Windows update keeps checking in & crashing, causing large pagefaults.
I went 3 hours with no ESENT alerts or corresponding audio drop offs last night.
Only downside is you must enable service & reboot when you want to run Window updates.
Have a look at your App log for ESENT alerts- If you see them, try this.
Hope it helps!