Well, I have an issue with the GPU fans diing because of the constant torture of being ran 24/7 and the environment they are in. So, I'm looking to install all the GPUs into server cases, and will switch mobos if needed.
Can you post a link to your case?
GPU fans dying could be the case; but if you are not running at stock settings and seeing above 72* average heatsoaked temps; the fans will die surely no matter what. It took me ~2-3 years to kill a set of fans on my Strix GTX980 in a cramped computer case with slightly questionable ventilation.... which for mining 24/7 since I bought it, isn't a bad run in my opinion. The GPU deserved a new $40 set of fans before selling it for $350 =)
Spotswood thread