[jrockway]

Just out of curiosity, did you use two factor authentication on the account? I understand that a common reason for accounts becoming disabled is because someone guessed the password, logged in, and then sent a bunch of spam (or something similarly evil). Two-step authentication makes this attack significantly more difficult. (But, of course, it makes your email harder to use. And malware can still steal your "remember this computer for 30 days" cookie.)

[ehsanakhgari]

No, I was not using the two factor authentication feature. I still don't know what caused this, but yeah, my account might have been hacked.