BF6 Playername changed.......

I was Playing in the Game 

the the Game Crashes (without Generating an Error Report).

After i startet my Game again my Gamername was changed from ElronMcBong  to some other Name. 

So what happend ? 

On the EA Website i cant set it back to my Old "Gamertag" 
System only say´s "Enter a valid EA ID."