If you have an Xbox Live account you may wanna check out an update that Rockstar has just published. To get the update all you have to do is login to your XBL account and you will be prompted to download an update!
• The upwards velocity of parachutes is now capped
• Bowling alley 'invisible pins' are now fixed
• Updates have been made to prevent players modifying stats for online games
• Infinite Nitro is now fixed