GARYTHEBRIDGE
I am having the same issue. I will go check the sample rates. It started happening when I upgraded to Windows 10 so still not sure if it is a SONAR problem or Windows 10. What operating system are you using?

I'm using Windows 8.1 - I also have disabled the regular updates.  I ran into a problem when Windows updated and it messed up the whole system so I had to restore it to a previous image.  Has been working fine and Windows hasn't updated.  I'm fairly confident the change wasn't a windows change (perhaps another program - Adobe's creative cloud is on there, which seems to be updating itself...)
 

azslow3
 
I think the best solution is to use different hardware sound interface for windows and route it to your music interface digitally (spdif). Note that can decrease latency tolerance of your music interface (making clicks) since conventional drivers do not care and they can block the system (Creig has written some time ago that simply enabled but not used HDMI audio driver was problematic for him).

I'll look into this - thanks.
 

Wookiee
Preferences > Audio > Playback and recording > Share drivers with other programs?
 
Is this checked or clear?

When it is clear, the sound won't work on the internet browser at all - in fact it won't even play youtube videos.  When checked - that's when I see the problem above...  Music slows down.  Pops and clicks when changing from one program to another...  General messyness...