Thanks for the report, and sorry to hear you're having issues! This is very strange, I tested in 2 different laptops with 2 different versions of windows but cannot reproduce yet.
Also, the only way to minimize the app is either by the user or via this, but I'm not calling that API anywhere (not even on the E2E testing module).
So this makes me think this is very likely an external thing messing with the app, maybe the antivirus or similar? Then again, that usually closes apps/processes, they don't just minimize stuff. So yes, when you have a min to test, please let me know if this happens in another windows computer. Edit: a word.
Edit: Just updated the page/app to 0.1.1 btw (did it on GitHub but forgot to update in here). This probably has nothing to do with your issue tho, it's just some minor tweaks here and there, not related to the app's window.