No idea.
But it is happening with other audio devices too. Apple are aware of the issue and currently investigating. They have had diagnostic logs from me now as well.
New iOS 17.1.1 fixed nothing for me 
Yeah I have heard it doesnât resolve the issue. I suspect itâs hardware related more than software related. I am speaking to Apple engineers again tomorrow so letâs hope they do manage to fix it very soon as it isnât just impacting hearing aid users but also those with other Bluetooth devices.
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I am having the same issues with my new Philips Hearlink 9040 which is related to Oticon in some way. Same firmware too. Anyway I have been dealing with Apple and they act like no one has this problem.
I am on my second iPhone 15 pro max, same problem on both with latest ios. I am on my second Apple case number sent to engineering.
Hearing aids work fine on my iPhone 8 plus, iPhone 13 pro max, and iPhone 14 pro. Ipad pro does have a problem too but I did not get these hearing aids for that. I will deal with one device at a time.
I am also having the same issue. I have Oticon Real One and have intermittent issues streaming from my iPhone 15 Pro.
Very loud crackle/static rather than the regular audio. Particular from the right aid. Also dropping out on one or both aids. Iâve tried a new pair of Oticon Real Ones, thinking the issue was the aids and not the phone.
I donât have any issues with the sound when streaming from my tv streamer.
Apple donât seem to accept this is a known problem. Has anyone had any success with a refund from Apple? At this point, Iâd rather get my money back and buy a regular iPhone 15. Anything to be able to listen to music / podcasts / social media etc again.
QUOTE:-
I understand that you are experiencing issues with your iPhone 15 while using it with your BMW. According to a recent report by MacRumors, Apple has acknowledged the issue and is working on a fix that will be available later this year1. The issue is related to a limited number of in-car wireless chargers that cause temporary disruptions to iPhone 15 NFC chips, which may disable the NFC capabilities of the device1. Until the fix is implemented, Apple recommends that iPhone 15 users experiencing these issues should refrain from using their wireless chargers in BMW vehicles2. The problem has sparked complaints from affected users on various platforms, including Reddit, Appleâs Support community, and MacRumorsâ own forums2.
UNQUOTE.
The above is from the Internet BING.
Wair a while before moving to iphone15.
This issue with BMW was fixed with 17.1.1. The other Bluetooth issues havenât yet been resolved.
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Noted with Thanks 
The latest iOS update (17.1.2) seems to have improved connectivity when streaming to the Oticon Real HAs.
Sadly tried and doesnât work. However, appears it had been fixed in the latest 17.2 beta 4 software. Apple are calling me today so Iâm hoping this means they will confirm they have fixed the issue.
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Just updated to new iPhone 15 Pro. If I hit Livelisten (by mistake, I never use it), I canât turn it off. Updated the old phone to latest OS and it does the same thing. Havenât found a way to turn it off without rebooting the phone. Amazing all these new âimprovementsâ.
Did you turn on Live Listen through the triple-click screen? If so, enter that same screen via the âearâ icon in the Control Center. On there you may find the Live Listen button âlit upâ and youâll be able to turn it off.
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Yup, that is the way it used to work. Not now.
Thanks.
Yes this is a known bug. Also affects my iPhone 12 Pro for example. There is though a way to do it still!
If you go into Settings on your iPhone and then go to Accessibility then Hearing Devices, click on the box at the top where it says which hearing aids are paired, then scroll down to the bottom and you can turn live listen on and off from there.
I expect Apple will fix the bug soon, but in the meantime this would be quicker than restarting your phone each time!
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Thanks, good tip. Didnât know that was there (only been using the app for 7 years )
You can also get here directly from the triple-click screen.
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You can normally, but if you read the last few posts in this thread then you will see that there is a bug in IOS 17.1.x and the three clicks menu way of controlling Live Listen doesnât work currently, which is the reason for my suggested workaround.
This is the triple-click screen:
Touch the text circled in red to go directly to the Settings screen that you referred to. This is faster than starting at the top of Settings.
Also, maybe my reply to @louyo wasnât clear. This is the Control Center:
Touch the ear icon circled in red, and youâll get to a screen that looks identical to the triple-click screen but isnât. On this screen, the Live Listen button works properly, and can turn Live Listen on or off. Works this way on my phone, and Iâd be surprised if it doesnât work on yours.
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Ok now that is actually better explained and yes that does work for me too (although I never use live listen myself).
Is 7.1.2 really working for you? doesnât work for me, will try 17.2b4âŚ