This has happened to me at least 3 times since (PC) launch. This needs a fix immediately. Trying to repair from the MS store once again.
Converse with fellow players
Back again after the slow drip initial download - played for a good long while (wading through the lobby slideshow) and then it suddenly quit. Now running a repair. We'll see how it goes in about an hour.
I'm still contending with the slow drip download speed from the Microsoft store. Imagine having 500Mbps download speed (should be 900Mbps but let's not get into that) only to dowload at DSL speed.