My R2R started acting up few minutes ago. The right channel started producing this hissing sound as if changing the freq on the radio. https://vocaroo.com/i/s1KfJVW3e9F2 I, first, thought it might be a problem with my speakers which were connected to the R2R through the 6.33m jack but then I plugged in my headphones and the right channel was producing the same sound. Has any one encountered this issue? It's happening on my laptop via USB. Sadly, I don't have an optical cable (I don't think my laptop supports optical at all, too) to check if it is the USB that is causing the problem. I have just emailed audio g-d. Hopefully there is a simple solution that won't require me sending it back and waiting for a new one.