Oticon More 1 dropping Iphone XR Bluetooth

I have had the Oticon More 1 for about a year now and in the last several months my iphone XR is dropping the bluetooth connection with my HA. Have been back to audiologist and they can’t seem to fix it permanently. Has anyone else had this problem? It used to work great. Now I am missing calls.

What IOS version is your iPhone.

Software Version 15.6.1

I found that IOS16 fixes most of my connectivity issues

Thanks. I’ll try updating to IOS 16.