One of my gpus had a leakage I didn't know what it was, but suspected it was from the thermal compound. I had it running at < 60C at 65 TDP. It started to give me problems and eventually windows wouldn't detect it. I then sent it to the manufacturer and got a replacement. From experience, said leakage will lead to bad news. If your card is still under warranty I'd use it and RMA it, if not replace the thermal pads.