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Just a wild guess, but are the phones "on" while they are charging? With the radio antenna lead that close it could be getting some RF interference or bleed over. Maybe the Bluetooth on in the phone could do it.
Just dealing with similar issue right now. My mechanic mentioned some of the USB charger plugs cause noise. Try plugging/unplugging it with bike running and radio on. In my case! I tracked problem to noise filter plug in line with LED headlight. Seems to have stopped filtering. Looking for viable replacement now.