I randomly got disconnected from the Minecraft server I was playing on and it wouldn't reconnect, it kept saying to re-launch the game and try again. After I closed the game, the launcher wouldn't open. So I restarted Windows and got a weird error, I didn't record what it said because I didn't think it had to do with the launcher, but it was to the affect that something wasn't installed now. When I clicked the launcher icon to try re-opening the game, it just vanished after giving this message "Check the Windows Store for more info about Minecraft Launcher."

I opened the MS Store and it said the Launcher was installed, so I clicked Play and got the same error message.

I got it working again by uninstalling and re-installing the Launcher, and then manually deleting the Minecraft Java folder, but clearly the launcher shouldn't be uninstalling itself.