I upped the buffers on AISO.
The song is small, 5 audio tracks and 2 midi (SI Bass and Session Drummer 3)
Midi tracks are frozen.
Other, more complex songs have no problems.
I even plugged in my Interface instead of using USB power source.
Performance indicates 30% and stable.
The main work I have done is to use (Process/apply effect) Gain on individual waves to reduce several peaks rather than a limiter.
Then I bounced to clip after.
No Audiosnap
Any other ideas?

New info, in the performance widget, the hard drive icon turns red occasionally

Any extreme amount of overlapping notes in your SI Bass or Session Drummer tracks?  Like cymbal swells or something?  Are the installed samples for those plug-ins stored on the same drive as your Sonar project audio files?

I'll check.
I take it those are things to watch for on dropouts.
 
Would it be at the problem locations (stop spots) or would it be a build up?
The overlaps are easy to find on the PRV.
How do I look to see if the Plug-in samples are in the same drive?

If your hard drive performance is maxing out, drop-outs make sense.  I don't think SI or Session Drummer could cause such havoc, unless the samples are streaming from the same drive as your audio files.
 
Check for the SD samples under:
     C:\Program Files\Cakewalk\Vstplugins\Session Drummer 3\Contents
And SI Bass under:
     C:\Program Files\Cakewalk\Studio Instruments\SI-Bass Guitar\Multisamples
(Replace "Program Files" with "Program Files (x86)" if not found above)
 
If the samples do reside there (on C: drive), next question is: where are you Sonar audio files?  Do you have a separate drive?

I think you might have nailed the problem here.
All my files are on one drive, tho I have several, and at least one other 7200 rpm
 
I keep the audio files with the song files so I can move songs and back them up as an entity knowing they are all together.

Indeed, definitely keep your project files (if that's what you meant by song files) with your audio files.  Ideally, each Sonar project should look something like this:
 
D:\Cakewalk Projects\My Song
     ...This is where your project files (.cwp) reside
D:\Cakewalk Projects\My Song\Audio
     ...This is where all the Audio files reside for the project.
 
The "My Song" folder is completely portable and backup-able on its own, as it contains all critical Sonar files.  The main thing is that the D: drive (in this case) is not used for any function other than storing project files and streaming their audio.  You can store other static data on this drive, but nothing that needs to be accessed in realtime by ANY program.

Yes project files, thanks.
Thanks for this, I'm going to reorganize.
Thanks for the clarity.
I do have the perfect other drive for this and should have done it long ago.

Excellent!  Be sure to use a 7200rpm or faster drive, and ideally not an external drive.

Thanks again, just in process of moving project files over.
Yes it's an internal drive, The external one is for backups.