Broadband :: Suddenly Cannot Change IP Address Anymore

I have not changed ISPs.Yes, I have contacted my ISP about the matter, but, as expected, to no avail.No, I am not using a new modem.To my knowledge, I have made no network related changes whatsoever since the problem arose.This will certainly raise the question "Why do you need to change your IP, anyway?" Well, to be perfectly honest, the game site that I frequent has a newly implemented hacking detection system that temporarily bans a user from entering all game rooms if it detects any suspicious activity on the user's part. This system is quite fallible and hence results in many unwarranted bans daily. In the event that I am unlucky enough to fall victim to the ban hammer, I simply change my IP and continue playing.