I've been following this thread & a couple other regarding similar issues due to Sonar Platinum doing some strange things for me, as well. After getting the 2017.08 update I have been getting these annoying, loud buzzes when I hit the "play" button. The "audio dropout" alert pops ups, nothing plays, but I get a very loud buzz until I hit the "play" button again. The buzz sounds almost like a very aggressive sawtooth synth sound at a low F#, but it is definitely not that.
This may happen once during a day-long session of recording, editing & mixing, or it may happen 10 times during a half-hour of just reviewing an earlier session. Completely random. It will happen on a project with 3 recorded tracks & one reverb plugin, or not, then on a project with a ton of tracks, synths, plugins, etc - or not.
Earlier this year I bought a Creation Station from Sweetwater, and it is used only for Sonar. They did a great job of pre-configuring Windows 10, and I religiously disable internet, virus scans, etc, when I record, edit & mix. I will enable the internet when I need to update Sonar or download new drivers for the Focusrite Scarlet, etc, but the only thing I have updated lately is Sonar. Prior to the 2017.08 update this issue never happened, even once. I'm wondering if Windows sneaked an update in during a Sonar update, and if combined with something in the 2017.08 update this problem manifested.
I'll probably do the 2017.09 update today, maybe that will help. If not, I'll revisit the suggestions in this thread & see if any of them help. Thanks, everybody, for all the good info you all share!