Razor Turret keyboard keeps disconnecting

Hi, I've only had the keyboard and mouse for about 2 weeks and its been great. The last couple of days the keyboard has been disconnecting and is gradually doing it more and more. I've checked the firmware is up to date,reset it and hard reset the xbox. I've changed usb ports aswell on the xbox and there's nothing else on the 2.4Ghz network that could cause interference and i'm about 2.5m fro the console in direct line of sight. Any thoughts?????