My phone is a Sony Xperia XZ3 and it just updated to iode’ 4.0 a couple days ago. I have been pleased to find that all my bluetooth audio devices connect automatically now. I had to go through the initial pairing process on all 3 of my audio devices but they all connect automatically now where before the update I was only having 2 of my 3 devices do that!
The problematic bluetooth speaker before is a Sony (model SRS-XB12) just like my phone so I figured that would always work-go figure! Automatically connects now so I’m happy!
Marty