Ok, strange problem. I have the following: MacBook Pro April 2010 model. Logitech MX3200 keyboard (comes with mouse, but I don't use it). Old RF receiver. Logitech Performance MX Mouse (unifying receiver). I only recently received the Performance MX. Since then, I have had some sort of issue that is very odd. After an hour or two of gaming or browsing the web, the keyboard stops working. Sometimes, unplugging and replugging it in will work, but other times, something very strange happens. Both the mouse and keyboard will freeze up as will the internal keyboard and trackpad, forcing me to do a hard shutdown. There is no way to unfreeze them except rebooting. If it matters, I am usually playing World of Warcraft when it happens. Any help? I have the latest unifying receiver drivers and everything.