I have owned the keyboard for 2 years and already 2 keys are green, they also behave strangely, blink. This problem, as I understand it, is observed by many. Logitech cannot help, because there are no services in 2022. I gave 11500r. behind the keyboard and they told me, go to the next entrance and fix it in the service. Okay, warranty expired, okay. But the same problem is observed in several other guys. So, this model turned out to be defective from the factory. But Logitech refuses to admit it.