Hi @Devin_Dahlgren ----- Thank you for the post and the feedback, the insight is always appreciated! I have split your post out to it’s own “support thread” so I can address this behavior you are experiencing with you directly.
To offer a quick update. We’ve had a handful of these types reports from other Roon + Sonos users and despite our tech team’s best efforts we have been unable to consistently replicate this error (i.e "Transport: Roon lost control of audio device”) in house. As I am sure you can imagine, when we are only seeing varying results during our test runs it is hard to make a conclusion on what the root cause (or causes) of the issue could be 
In light of the above, we have plans in the works to set up some field testing in an environment where the issue can easily be replicated. A contact of ours who is in the area, has similar issues to you and we’re optimistic that using his setup as a testing ground is going to yield some results.
In the meantime, I would like to get all of your information into the ticket we have been using to track this issue so we have it on hand. Please see below.
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Please provide a brief but accurate description of your current setup using this link as a guide.
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Please describe your network configuration/topology, being sure to provide insight into any networking hardware you are currently implementing.
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Please list the Sonos devices you are currently using in your setup.
-Eric