Metalsiege

I've been having issues on and off with keys that stop responding after a while. Specifically, my Windows Start key will stop working and the only fix I've been able to do is updating the firmware. Even then that just delays the inevitable because it always stops responding sooner or later. A newcomer to the non-working keys is the ESC key. Even flashing the firmware doesn't give me back the function. Anyone else having issues and possible solutions? It's so annoying I'm tempted to go back to my old wireless keyboard...