Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
For what its worth, I am running an audigy zs plat and I just started experiencing this problem tonight. I have played doom 3 in Digital output only mode for weeks with no problems, however i just changed up my speakers and reverted back. There have only been two other changes since yesterday...