In order for them to become banned, they either:
- got banned by a moderator. Did you check the moderator logs like I suggested?
- got banned by a 'promotion' or cron job. Look at all your cron jobs and see if you have any from modifications. And, check your promotions
- someone did the change directly from the database. Check your access_logs. You may need to get help from your host with this.
Check all three of those.
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