HI I just found the fix after many hours of frustration. It's simple.
Windows 8 and 8.1 users just go to:
Device Manager -> sound, video and game controllers and disable whatever AMD or NVIDIA High Definition Audio Device this way:
right click in the entry that says AMD or Nvidia and choose disable
say yes and never your pod or whatever line6 device will never stop again...
You can offer me a beer when you come to Portugal.
:) Cheers