Recently purchased UAD Apollo twin USB to replace my Roland Octacapture because of crash issues over many years.
Unfortunately, the crashes seem to have followed me.
It often seems to happen on simply pressing play or record (I get a nasty 'crack/pop' sound - like you hear when unplugging a guitar lead when the amp is still turned up). From that point on Sonar stays open, but trying to play audio just gives repeated 'crack/pop' sounds thereafter on each mouse or keystroke click and the audio engine wont engage.
Rebooting the Apollo or rebooting Sonar by themselves often doesn't seem to help. The only solution is to turn both computer and Apollo off. 
At one stage I thought it might be VST instruments and gradually eliminated them - however it still can happen with just a single audio track. I might go an hour or two without a crash and then have 3 in half an hour.
Any ideas?
I've scoured the UAD site and Cakewalk site but found nothing helpful as yet.

It can also be a problem with your USB port on your computer. Even updating does not help, because its up to the hardware.
We have a lot of laptops recording tapes and vinyl. And every laptop has its own behaviour with the same USB audiointerfaces although its the same SONAR and the same windows and recording to the same NAS-Server. Some laptops crash by closing a project - some crash by changing the resolution from 44 to 96 kHz. But oddly enough, the same audiointerface with an other laptop does the job without crashing SONAR.
For example our DELL laptop is killing the firewire to an RME every two hours. An HP works with the same RME device for weeks.

You may want to try increasing your audio buffer in your Apollo Console settings. I notice that my Apollo Firewire's buffer got reset to 32 by accident and caused me all sorts of problems.

I also purchased an Apollo Twin USB and have experienced nothing but audio dropouts with SPLAT. My PC and USB ports satisfy the recommended spec and it worked perfectly well with my previous interface, a Motu 24io. Tried all buffer settings and whilst I notice an improvement with some settings, the problem never completely goes away - even on very modest projects with low track/plug-in count. Currently discussing with UAD support but they are taking days between responses (actually more than a week since the last despite reminders). I'm reading similar issues elsewhere so it appears to be a fundamental issue with the hardware or drivers - or it is incredibly sensitive to hardware setups. I'll pass on any solution if I receive one.

 similar thread http://forum.cakewalk.com/FindPost/3396871
 

scook
 similar thread
 

 
Thanks

I read by the german seller "Thomann":
- Some USB-Ports from some Mainboards have great problems.
- Some mainboards do not work with this interface.
- USB3.0 USB plug-in-cards should not work
 
- Energy saving must be deactivated. !!!
 
By the way, I'm working 7 days the week with a Roland OctaCapture and had never problems. The computer is nearly running 24/7. Over 2 years.
If you had problems with the OctaCapture, I'm very sure that this is up to the hardware and/or drivers from the USB devices.
Make a windows system restore point. Try to update the USB ports - for example with "driver booster".
 
 
 

Sorry folks that I haven't gotten back sooner - busy days and some time in hospital!! (nothing too serious though).  

• Thanks THambrecht for the USB information - i will definitely look into that.
• Sorry to hear Immrama that you are having troubles too - I hear your frustration! Love to hear of any solutions you might find. 
• Good suggestion Whattarush - but I have tried pretty much all the buffer settings with no observable difference.
• Appreciate the link Scook - and the registry suggestions etc there! Will experiment.