Game crashes, then changes the gamertag back to the default suggested username. This started happening after the 1.11.4 update.

When I logged into my new Xbox Live account, it tells me to choose a username or use the default one. I changed SwungBand492055 to ItsMysicLore, and I logged off. After a few minutes, I tried to log back onto Minecraft, but the game crashed after several lag spikes. It finally worked after several attempts to log on, and my username glitched out and seemed to try and load as ItsMysticLore, but ended up as SwungBand492055. I know this had happened to many other people, please fix it.