It's quite difficult for me to read the values in the image you posted, even though I saved off the image and zoomed in quite a bit.  It gets blurry before I can properly make out the numbers.
 
MY ATAPORT.SYS execution time is listed as .175 and some change, and it looks like your is either .33 something or .99 something - too blurry for me to tell.  Either way, it is quite a bit higher than what is reported on my system.
 
Do you run in IDE mode or AHCI mode?
 
Also, what happens if you start a new project, insert a single audio track, import a song, like an MP3, to that audio track, and hit Play?  Does that play properly, with no clicks or crackles?
 
I am wondering if there may be some issue with possibly the particular connector your hard drive is plugged into, like perhaps it is a SATA III drive plugged into a SATA II connector on the motherboard.
 
I would certainly recommend picking up a second hard drive, as that should greatly ease the bottleneck of trying to run it all from a single drive.  Lots of folks, if not most, keep the OS and programs on one drive, and keep sample libraries and projects on a minimum of one additional drive (many split libraries and projects onto 2 additional drives, for a total of 3, and some have even more drives).
 
I am continuing to look into this for you - perhaps someone else has some ideas?
 
Bob Bone
 

Hi Bob
I did two hours of recording today without a single click or pop, then it started again but all the drivers were running under 1ms. Something very strange is going on, I may have to open my computer and have a look with my hardware. I might even remove my internal sound out, since it is not being used. I will move my project to a separate Hard Drive. Also what is IDE and AHCI mode ?
Thanks

If you have more than one hard drive, then by all means move your Cakewalk Projects folder to the additional drive.  This will help performance.
 
You would copy the current Cakewalk Projects folder to the other drive, then go into Sonar and change the File Location for Projects in Preferences to point to the new location, then after making sure everything was cool you could delete the original Cakewalk Projects folder from the C: drive.
 
IDE and AHCI are 2 kinds of operating modes for hard drives.  You can get into trouble switching from IDE to AHCI mode, so the slight performance gain from AHCI may not be worth worrying about.  (it can cause boot errors, depending on how and when the mode switches to AHCI).  AHCI also supports hot-swapping, but that's not a compelling reason to switch to it.  (I happen to have a hot-swap external bay on my case, and I routinely scrub other people's hard drives for viruses, so I happen to use it, but that is not an ordinary scenario for most users).
 
It would seem that the disabling of the Wi-Fi adapter has eliminated most of the problem for you, and please note that you would only need to disable that when getting ready to run Sonar.  Once your Sonar session completed, you could once again quickly enable the Wi-Fi and have at it.
 
I am not sure what is continuing to cause this problem to kick in - I am wondering if there is some scheduled task that kicks off every once in a while, or something like that.  Perhaps you have something like EasyTune or whatever it is called, enabled and running - this or something like it would be some sort of performance tuning functionality.
 
It is encouraging that you got a couple of hours of recording done without trouble, it's just a matter of detecting the culprit.
 
Immediately when it happens, can you close Sonar (save your work first, of course), and run LatencyMon?  If LatencyMon shows a problem, this time please publish all the stats.
 
Bob Bone
 
 
 

Based on the image posted (it's a bit small but thankfully my eyes are good lol), these are your top listed items with a high execution time....

Ataport.sys         @0.333
tcpip.sys             @0.244
CLASSPNP.sys     @0.167
ntoskernl.sys       @0.142
wdf01000.sys      @0.142
USBPORT.sys       @0.139
NETIO.sys            @0.118
NDIS.sys              @0.114

Based on that, compared to what I currently have showing in my set up. I would say leaving your network active seems to be increasing your latency although nothing on that list shows anything over a 1ms spike.
The accumulation of dpc could be causing issues, on my Latencymon drivers section, all items are sitting below
0.06 which doesn't sound like much less but as all these processes accumulate, it increases the load on the pc.
So disabling all networking functions would probably help a great deal.

With regard to it being fine for a long period then it started acting up, do you remember what you were doing? Did you have a bit of a break in between then came back to it to find out it was having the funnies?

I would check that all sleepmodes are disabled, also check there are no scheduled tasks like defrag running or starting up when the system is idle or a certain amount of cores parked.

Make sure windows updates and such are disabled also, if anything like that kicks in whilst idle or working, you will find it WILL impact performance and cause issues.

Also take a look at this..... http://bitsum.com/about_cpu_core_parking.php
your processor is listed as one that benefits from disabling of core parking. Might be worth getting that looked at. If the cores are parking and unparking all the time, this will cause issues for some.

Hi guys
Thank you so much for all your help. I will look at disabling CPU parked feature and hopefully together with a separate Hard Drive. It will help eliminate the problem. I will also look at the other culprits that you both have suggested. Once again thank you very much.

Be careful with the core parking changes.
 
I looked at them, and chose not to implement them.  I just changed Windows default options in the advanced power plan settings, to set the minimum processor state to 100%, and my system hums along quite happily.
 
There is a hot fix from Microsoft that deals with core parking - I have Windows 8 so it did not apply to me.
 
For sure I recommend moving projects and sample libraries to a 2nd hard drive - make sure you research the proper method for moving any sample libraries, PRIOR to doing so, to reduce the chances of problems from doing it wrong.
 
I am not waving you off of changing core parking behavior on your computer - just suggesting that you approach it very carefully.  Someone's home-grown utility may suddenly have issues following a future Windows update patch, as an example, and the same may hold true for changing registry values - not to mention the potential for bad things to happen if registry edits are not done properly.  Just be very careful, if choosing to embark on such an adventure.
 
Bob Bone
 

No problemo mate, keep posting back with your results though as this topic may be handy in future for others who are experiencing similar issues.

Also, please be careful and make sure you make a system image before you go disabling too much and go to far which may render your system a dodo. I always make 2 images on a new build. The first image is after I have installed windows and done all the standard tweaks and adjustments. Then do one after I have got everything running as best I can. With this scenario, you can revert to a clean install in future if you wish to give your system a refresher or have dropped a lot of the programs you were using at the time. This means your registry and filestructure will be as new so installing your new items will be a clean affair. The other option means that if you experience problems later or notice issues which you think you may have inadvertently caused through random moments of "lets see what happens if i do this", you can return to a working config with all installed.

Hi Bob
Thanks mate for the word of caution. I will do the easy stuff and see what happen first. Once again thanks.