Sounds to me like it is time to return it on warranty, Gigabyte laptops generally run hot but shouldn't be quite that bad at peak. I would have recommended a re-install but since you have done that and it is under warranty I would noit recommend opening it up to take a look, just RMA it.
I currently use these and they are amazing, great sound and bass that can knock a mug over.
https://www.amazon.com/dp/B00K5NYNWS/ref=twister_B00ZWLMBUY?_encoding=UTF8&psc=1
I am personally a big fan of the corsair headset. Granted, I have switch to a true microphone and headphones since I am an audiophile, but I was never disappointed by the Corsair you listed. Sorry if this was a bit late for you.