Hello, About 2 1/2 some years thing years ago i invested in the Z68 motherboard and got a mechanical keyboard ( Razer Blackwidow Ult ) too which started to show a issue were the key would not type or it would spam the letter \ number pressed so i sent it back and got a new one and after about 7 months got the issue again. Then i got a Z77 about 10 months ago and picked up a new mechanical keyboard ( Ryos MK Pro ) when it was released a few months ago and again started to get the same symptoms were the keys type or not or spam the key pressed. I started to think it was the keyboard at fault but i have had a new one since then and since it's started yet again and the Z68 and Z77 are so alike is the only thing really the same still. You think it could be the PSU at fault making the keyboards faulty ?. It's the only thing i can think of coursing the issue now but every time i checked the voltages they all been pretty spot on even when gaming although of course this is though software. One thing for sure i have a keyboard killer some were.. Just to note i have had 0 issue with any other piece of hardware over the last 2 so years.