Lighting falls quickly (Exchanged!)

I have the keyboard now about 2 months.
After 1 month, 2 keys have already begun to weak lights, F8 and the left arrow key. Really not often use buttons ...
Meanwhile, F8 and the left arrow key have failed completely. Added to F12 and the arrow came up.

On the whole, I find the keyboard really great also from the settings. But that's a little sad at the price for it after 2 months 4 buttons are no longer illuminated correctly.

Edit: I turned down at the Roccat Support of I meant to write to the Amazon support to make change to the keyboard. Everything worked and the new keyboard I use now already a few months without faulty lighting :)