After a large amount of complaints, Microsoft is investigating into gamers being booted off Xbox Live by hackers.
Hackers are using data flooding tools to attack fellow Xbox gamers. Hackers are able to identify the IP address of the Xbox 360 hosting a game, then hit it with a Denial of Service (DoS) attack.
Microsoft says: "We are investigating reports involving the use of malicious software tools that an attacker could use to try and disrupt an Xbox LIVE player's internet connection."