this keyboard has walked a long time, but today, because of the incessant and unnecessary updates to Logitech, the keyboard regularly bug (game 4-5 hrs), obliged to disconnect / reconnect, damage. a few months later: Upon reflection, I can certify that it is the Logitech updates that cause. But the "bug" is like a mini-keyboard that lasts reboot 15-20secondes. Not cool in "pro" gaming