My account got randomly disabled once, after submitting a ticket and waiting a couple days someone from Steam Support contacted me:
It appears as though the account may have been hijacked by another user. Please follow the link below and take the prescribed steps to ensure the security of the account in the future:
TITLE: Account Security Recommendations
URL:
http://support.steampowered.com/kb_arti ... -OAFV-8478I have reset the account password and sent the new login information in a separate e-mail. If you do not receive the e-mail and you are running a Spam filter, check and make sure the e-mail is not being filtered as spam.
Note: Passwords are all numbers.
The new Secret Question will be set to "What did customer service reset your password to?"
The answer to the Secret Question is the new password that we have sent to you as mentioned above.
Once you login to the Steam Account, please change your password, secret question and validate your email address as outlined here:
Title: Resetting an Account Password and Secret Question
Link:
http://support.steampowered.com/kb_arti ... -AFZC-7069Please let us know if we may be of further assistance.