Instability maintaining bluetooth connection when device is vertical in a busy area

Hi,
I feel like I’m going insane…

whenever i am in a busy area, aka a train station or street, my fp6 has trouble maintaining a connection (audio fully cuts out and does not get through at all)with my sony xm6s if it is in my trouser pocket vertically/ or i am holding it vertically while walking, but if I hold it horizontally (screen facing up) it maintains the connection fine.
I did not have this issue with my previous phone (redmi note 13 pro5g) in the same locations and the same pair of headphones, so i am lead to believe it is the fairphone having issues

Has anyone else had this issue? thanks