Hi Everybody. Well duh. I am amazed. I have been using the WDM/KS drivers forever in SONAR. Over the past few years glitches and dropouts have multiplied to where I have programmed a "hot key" to stop and restart the audio engine in SONAR (I use X3 64 bit). I have searched high and low for a solution and even considered changing soundcards and all sorts of stuff. Today I changed the driver being used from WDM/KS to ASIO and SONAR X3 is as stable as a rock! We shall see how things play out over the next few weeks but so far it's magic. 

Yep, ASIO drivers are recommended when available.
 
Sorry you've been making do with sub-par drivers until now.  Send up a smoke-signal next time, will ya?!
 

Some cards have a favourite, and for pro cards, that favourite is often ASIO. Always one of the first things to try with a new card: If one mode gives you issues, try another. Some cards are happy as clams in any mode, others are complainy and only like one.

I'm sure I read somewhere when I bought x3 that they recommended using ASIO drivers, at least its all sorted now :)

UPDATE: Ran a large project today. Still glitch free. Mixdown over the next few days.