Mouse and Keyboard suddenly close to unusable, virus?

Hi, First of all, the problem!
The mousecursor can be moved without any problem, but it clicks randomly/spamclicks like 1000times/s. Some things like the windows taskbar sometimes get locked completely and i have to force it to make it work again.
The keyboard while typing doesent recognize some keys and or suddenly spams like 50 of thoose characters!

I'm able to write this because when i'm searching the computer with malwarebytes (completely, all harddrives, dvd player and the "scan for rootkits" box is checked) is running. somehow the comuter behaves normally until i restart it.

So what have i done with my computer recently?
I just played through the main GTA V mission, and i downloaded the native trainer and ScriptHookV mods.
News have lately come up with reports on that some GTA V mods contain malware. but this mod was NOT one of them!
I have the Corsair K70 RGB, i updated the firmware and driver wich (FINALLY) enabled 16.8M colours, i enabled that and created a simple profile that i put on the keyboard memory.

As im writing this, im removing newly downloaded files and the mods from GTA V to see if it works, but i dubt that this was the problem since im careful on the internet and i already new wich mods for GTA V contained viruses. Im not 100% sure, but i dubt it to say the least.

Neither F-Secure nor MalwareBytes Anti-Malware has found nothing (full search)

This might be a problem with the K70 RGB im using, because when i turn off the lightning effects it seems to fix the problem completely. Its like if my motherboard USB controller is beeing overloaded or something..