I'm not completely sure, but some bugginess might've made it through and it can tend to do that. It's best to pick the default format you want at the start and stick with it. It tends to lock up if you switch again after that. (though switching devices doesn't seem to be an issue). It's become an issue in Windows 10 for a few months now, but I don't know if Microsoft will end up bothering to fix it.
Also, do not touch the Spatial Audio tab at all, if you're not using 2ch. Don't even click it, as it causes similar issues.
Honestly, the system of switching settings in the audio device properties seems to be a mess right now, however I'm curious if they're working on a new W10 "Settings" version of it, like they have with most other things. But who knows if it'll be more polished, as the other ones seem to just be new UIs for the same old mess of a system. If the programmers make tweaks to these things, not knowing how or in what way everything in this system, with thousands of different devices, links together, then.... things get broken. They've seemed sloppy so far.
