Just to ask...Have you installed other DAWs onto the same system or drive with Sonar?..
Reason being I Find Avid PT 12.5 installing drivers of it's own, on some of my systems, causing perhaps issues with audio and midi .
Also some application which is always on, and running checking for updates....(and some know how I feel about that these days)..lol
And On my Mac Pro...Melodyne Studio 4 Crashes in standalone multi track mode, when trying to save the sessions, when trying to get tempo mapping and such, of badly performed tempo players....( I thought it might solve for, so I bought it)...well we do dream of solutions for bad timing here for some who cannot play to a click, or keep time .
any hoot..The tech told me back a few months now, that the mac version has a bug,(no vu metering when recording is showing up) and they are working on it.
Haven't heard of any updates yet though....and they got my data dumps, saying something is wrong with the audio drivers...Yet it is always Melodyne crashing it.
And I do not think PC is the same problem..in the same way...but file linking or saving might be...Management issues of data controlled via...Device managers.....But seems all things when the XY or Z is in constant flux...no one can really solve for x untill it is stablized to no change...To standards.
Good luck and cheers...Keep a stiff upper lip, and your hair on your head, when told..."Please stand bye for station I Dent if i cation"...could be a long wait for...if not found..But I hope You find, or they fix it.....
Best of the Day to you!
Cheers!