I got a Gainward GTX 1060 about a year ago. I overclocked it a bit, and set the fanspeed to 80%. It has worked fine, I've heard a slight rattling noise now and then but never gave it a second thought. Now the rattling noise is louder. I took the GPU out and tried to tighten the screws, but that didn't help. When I hold the GPU upside down (as it is mounted in the case) and tap the fan(s) lightly, it makes a similar rattling sound. When the fan spins and I touch the middle of it very lightly (yes) the sound also either disappears or gets very quiet compared to what it was. Suggestions?