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The flickering and green lines could mean a power supply voltage fluctuation, such as one caused by a failed filter capacitor that keeps fluctuations in internal voltage level(s) steady.
Or, there could perhaps be a shorted component, and/or a loose connection or bad solder joint or dirty/loose connector, causing the problem.
Some more information is needed though: What functions does the problem *not* show up in, when using that function or those functions (as opposed to the network functions of internet radio, AirPlay, or Bluetooth) ?