Bests & Worsts Reviews from Amazon

I purchased this power supply on july 14th but I was only able to test it today because I had to wait for the rest of the PC parts to arrive, so I couldn't return it to Amazon. It worked fine for about 2-3 hours when suddenly my PC shutdown itself,I thought I was having electricity problems but the rest of my devices continued working fine. I Tried to power on the system again but nothing happened. I disconnected my GPU and tried to power on again, this time the system start working but after a few moments it shutdown again. I continued disconnecting things until there was only a a fan connected, only then the power supply was able to keep working. This make me believe that I was unlucky enough to end with a defective unit that can't bare to supply even the power required by the CPU. I've contacted Thermaltake , I hope they're willing to fulfill the warranty. [UPDATE] The RMA process with Thermaltake was a waste of time and money. I asked them if the cover the shipping costs and they said that I had to pay the shipping to them but that they will ship back the product at no cost to me. I don't live in the US but I made that clear from the beginning and I filled the contact form with the information from my country, that didn't seem to be a problem to them at the time so I decided to send them the PSU. The shipping cost me around 27 dollars but that still was cheaper than buying a new PSU keeping in mind that the would send it back for free. When the PSU arrive to Thermaltake location I didn't receive any notification, I wai a couple of days and then contacted them, I didn't get any answer until a few days later when they told me that there was nothing wrong with the PSU, which is odd because I tested it with 2 different PC but I was willing to trusted them and took it back. The problem was that they weren't willing to honor their word on the free shipment to my country, they told me that they could only offer me free shipping to Florida but if I wanted my PSU to be shipped to my country I have to pay for it.