I saw some vague stuff on the web about possible permissions - I am still digging for info.
 
Does this occur if you EXPLICITLY launch Sonar with the 'Run As Administrator" option?
 
Quick enough to test - just to rule out any potential for permissions issues.
 
Thanks - just right-click on the Sonar launch icon and click Run As Administrator and see what happens with regard to that error.
 
Bob Bone
 

Hi Bob,
 
It appears Alex's suggestion has worked. Just completed 3 hours without a single issue :-)
 
Mike

I put "solved" because people tend to check out threads labeled as such, and this thread could be really helpful to people who have problems with Focusrite interfaces...and it also emphasizes the importance of staying up to date on drivers. However, please feel free to remove if problems re-occur. 

Good news, indeed.
 
Now, do you still have some hair left?
 
Bob Bone
 

Good glad it worked out. Would be best to mark the post as answer as it works with filters I suggest.

The real issue here I think is that focusrite driver/firmware updates often do not go smoothly and need to be cleanly installed and reset most of the time. Been a victim too many times!

After that they are as stable as a rock.

Cheers

The last time I had a stability issue, it ended up being a little midi USB device that was plugged in but not being used for anything. It was plugged in to the USB port but not to any midi instrument. When I unplugged it put it away, my system became rock solid again.

[Solved] - I would go as far as saying yes, it's much better. However have plugged my midisport 2x2 back in and now I'm getting the transport won't stop issue. Have to close Sonar and open back up again.
 
Am I right in thinking the MidiSport drivers are a little suspect?
 
I'm awaiting delivery of a new Midi interface which doesn't require a specific driver - it's just plug 'n' play with Windows. Perhaps this will be better?
 
Thanks for your comments all - my hair is regrowing ;-)

I have found that any unpowered USB devices (as in devices that are not powered from their own power adapters but are using USB power) can cause very unusual behavior with DAWs, including the transport behavior you're describing above. I'm not familiar with the midisport 2x2, but I'm willing to bet money that you're not powering it with a separate adapter? I've seen this too often on my own system.

It's powered by the USB as will be the new one.. I'm only going to use it to get some hardware synth sounds into Sonar - will unplug it once I'm done.
 
 

Hi there, was hoping that the issue of unpowered USD devices might be helpful to the problem I am discussing at  but there was for me no change of my "Sonar X3 Studio" behaviour.