Welp, time to shop for new PSU then, this one is only two years old. Which brand or model is more reliable?
I've had a good amount of luck with Corsair.
They have a great return policy, too. My complaint with them is that the experience I had with customer service was absolute shit. Talking in circles, indirect answers, passing the buck, that kind of thing.
I opted for an expedited shipping that I was willing to pay for, and after a few days, when I should have had it, they reached out to say that they didn't have my model in stock. They then offered to upgrade it, provided I pay the difference, or give me a lesser model without refunding the difference, neither of which are solid options for me as the customer. I chose to buy a new one outright from Newegg and use Shoprunner for 2 day shipping and asked them to just refund me the money instead of RMAing the thing. They hassled me about that and tried to say that I couldn't. It took a few back and forths, but they did it.
In the end, with a rebate, I got a better, quieter, more energy efficient PSU for cheaper than I paid for the original. It just required a bit of a headache.