A Microsoft file hosting and synchronization service.
I'm actively working with Microsoft on this. Make sure you're running 29.084.0426.0006 (which is still exhibiting the issue). That way we can confirm that the issue persists in the latest version.
If you want to chat about it go to this Discord site: https://discord.gg/R7kD52p. We can then PM each other so we can gather more information for Microsoft. Just an idea, no need to discuss the use of Discord here. Ignore this if you don't want to.. Let's just focus on the issue.