Sorry to necro, but I'm having this same issue.
I have had 2 of these cards. They've both failed at something. My first card had a loud hissing noise being sent through the speakers. The second card I received as a replacement had the same issue. I eventually got it to work by plugging my headphones into the RCA jack and foregoing the headphone jack.
Great, right?
Until I started using it. The hissing stopped, but now the audio pauses whenever things are happening on the Windows side. If I unplug a USB device, the audio pauses. If I plug one in, it pauses. If I'm playing a game and using Discord... the audio randomly pauses.
I can't stand this. I'm beyond my return for Amazon and I'm beyond my patience. This card has been an absolute disaster and I would not recommend it to anybody. Nice try EVGA. Get at me if you have a solution or want to help but 45 minutes on tech support and all I got was "your PSU is the problem". Well I proved that wrong but switching ports on the back from plugging my headphones in to the RCA slot. But now the IRRITATING pauses.
My 10 year old Sound Blaster works better than this.
If anybody has any solutions, please help me. I'm out $200 and weeks of troubleshooting. I'm about ready to throw this POS in the garbage and chalk it up as a sad waste of money.