Lights freeze on Blackwidow Chroma V2

When I start my pc my Chroma lights turn on after some seconds but after about half an hour of gaming the lights on my keyboard complete freeze.
Not only the Chroma lightning but also the capslock, numlock and scroll lock lights don't turn on or off when I click on them. The keys do still work tho, it's only the lights. And the 5 macro keys have a massive delay (30s to 1m). The lights on my mouse pad, mouse and headset just work fine.