I was able to play Minecraft between 6 and 7 different times throughout this past week.  I double clicked on the same icon I've been using to play Minecraft about 10 minutes ago, and now for no explainable reason, I was kicked back to the launcher screen, with this gray message box that says:

Error

Game Crashed

An unexpected issue occurred and the game has crashed.  We're sorry for the inconvenience.  Exit Code: 0

But I haven't done or changed anything.  It literally went from working, to not working.

EDIT: So I tried clicking the Play button on the launcher screen, I got that error message two more times, and now, it's working.  But that error message coming up shouldn't be coming up if the game works initially and there are no changes to the PC.

I have attached my launcher_log.txt file if it helps.