Bluetooth poor connection with headset

I have a Fenix 8 47mm Solar. Previously using JBL 760NC headset vía bluetooth with no problems. Upgraded to Sony WH1000MX4 and as soon as i start playing music micro cuts start to happen in the connection.

Watch BT + JBL760NC works perfect.

Phone BT + JBL760NC works perfect.

Phone BT + Sony  WH1000MX4 works perfect.

Watch BT + Sony  WH1000MX4 works wrong.

I'm guessing a watch problem. Beta version 13.18

I was previously in love with my instinct 2 camo expecting a major upgrade to fenix 8 but battery drain issues plus this is letting me down.

Any comments? Any help?

Thanks in advance

ps: my english is not good... sorry about that :D