I have two Bose portable speaker products and they both do the same - that is as a speakerphone the transmit audio is choppy to others on the call. Very frustrating. The Micro Soundlink and the Soundlink II both are the same. What is the fix - or is there one?
It's definitely strange that you are seeing exactly the same issue with both of your speakers at the same time! Have you been using them both with the same Bluetooth device? If so, what device have you been using them with?
If you haven't already, I would definitely recommend testing them with another phone, tablet or computer on a voice call.
Also when using your speaker as a speakerphone, have you been using them on standard phone calls or VoIP calls on software like Whatsapp or Zoom?