If you've got it daisy chained it may be that the device is sucking too much power out at once and is unable to keep up when it's all processing. It's not something I've heard of before, but Logitech would probably have more information than I would. You may need to try a bit of troubleshooting though, on other systems, different games, different ports on the system (for example some ports on the front of computers are not powered), and even with different or no addons attached to the keyboard. Might be a case to see if there's a warranty on your product just in case.