So because this issue still hasn't been fixed, I assume you're having trouble finding the cause? Anyways, sharing.

I'm on android (S5)

Fatal error 1002: when refresh brings up 'Welcome'
No fatal error: when you battle off all 3 people and 'Welcome' appears automatically
When trying to battle 'Welcome': You cannot battle this player at this time

So is this non-player lacking some attributes that the new algorithm doesn't like? Can't you just remove it completely?