600T corsair case acting up

I've had this case coming up to 6 months now. It's been amazing. Recently I got a gpu cooler that I hooked the fan to the fan dial of my 600t case. About a week later I'm now experiencing some problems. I noticed one time while I was playing a game and had my fans on the lowest setting, which I commonly do, that my fans were making odd noises. They were fluctuation, both in speed and light. I don't know if I can RMA it, or how RMA works. I don't have the box for the fan anymore and I'd prefer not to have any down time. Anyone have any solutions or ideas?

PS. I turn off my computer for a time and unplugged my 750w psu for a while. I then turned back on my computer to have the case running at 100% fan speed constantly as if it's ignoring the dial which is set at the lowest speed.