Problems hearing Sena S20

I own 2 Sena S20. I have had many different problems over the 5 years which I have handle as best as could be but recently when using ... only 1 of the units can be heard. I can hear the person using the unit but they cannot hear me. We have switched the units on the other base and the problem is still there. Is it because 1 unit isn't receiving or is it because 1 unit isn't sending. I have tried a fault reset and factory reset as well as all the reset updates . I am at my witends with these units. 


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