I'm surprised how ignorant or incapable of Sony in managing this issue after so many similar postings on various forums.
I wonder if anyone has brought this up to Sony and follow up aggressively.
There's a similar discussion over at xda seems no solution yet. I've the sw2 with the Nexus 5 and BT on the Lexus CT 200h and I'm having similar garbled voice issues.
xda-developers - View Single Post - [Q] Sony Smartwatch 2 Bluetooth Issues