Multiple 20S problems

I have two units and both of the have the same audio and radio problems:

1. When I try to listen to music from my phone the audio cuts out after a few seconds. I've tried factory reset, reverting back to 1.7.1 firmware, resetting my phone ... nothing works.

2. When I turn the FM radio on I cannot turn it back off using any method.

3. One my second unit when I use the intercom while music is playing, the intercom does not suppress the volume of the music so I can't hear the intercom properly.

Is there a solution to these issues or have I bought duds?


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