Generally second-factor authenticators like this have to be "synced" to your account, so the authenticator on your iPhone was the only one that could validate a login on your account. The whole point is that only the person with physical access to your phone can access your account.
I don't use the authenticator in GW2, but I did for World of Warcraft and I have done the same thing at least twice. Blizzard was ready and quick to respond, but unfortunately Arenanet may not be. It's probably a simple thing to fix, once they get to it, but you will likely just have to wait.
Be prepared for them to need you to verify your identity. Blizzard needed me to take a photograph of a photo ID.
Like I said earlier the main culprit should be the CPU. It is just too weak.
A slow CPU will make the game pretty unenjoyable, but it should "work" fine. Crashing like this indicates there's an actual problem somewhere. As I said above, the Athlon II X2 250 exceeds the minimum requirements, ever so slightly.
MissLuckyBlades, on 13 April 2015 - 02:44 AM, said:
For everytime I have played this game in the past, I had this problem too, but it just seems that it's gradually getting worse and worse overtime. :-( :-(
Has the game ever been reinstalled in that time? Try running the game with the -repair command. Instructions are at the top of this article. A possible issue, especially with older installations, is that the game's files can become corrupted or misplaced with updates.
But I don't know if that's the cause of this because those sorts of issues don't typically cause your entire system to crash and require a manual restart. That sounds hardware-related. Definitely take a look at updating drivers and monitoring temperatures as well.