Got mine today and upon opening and plugging in I had the issue where each key was repeating like crazy. One normal keypress yielded about 15 letters on screen.
Thankfully all I needed to do was fn+R for 5 sec for a reset and it works great.
theconejoIt's an macro feature that multiples your key presses x2 x4 x6. I had the same issue with an CoolerMaster Pro S. Weird that is set by default.
theconejoFor anyone looking to fix this without the reset, it's the "Speed Mode" function. Hit Fn+` and then hit 1, and it should reset back to regular speed. It's listed on the second-to-last page of the manual.
Thankfully all I needed to do was fn+R for 5 sec for a reset and it works great.