why iPhone 14 won't connect to hearing devices and also crawly/ Older iPhones connected great

If you look in your Oticon On app on your iPhone and touch the Hearing aids icon at the bottom of the screen it will display Left and Right with a Green Checkmark. Touch "Left" or "Right" and it will display the firmware installed.

I also wear Oticon More 1. The Firmware up date by Oticon version 1.4.1 solved the disconnect issues with iPhone iOS 16 and up. I am running iOS 16.1.2 on an iPhone 13 Pro Max and everything has been has been stable with my hearing aids. Oticon released 1.4.1 about 2 weeks ago and you can see your audiologist for the update.

The solution for all my frustration was solved with Firmware1.4.1. Let us know how it goes.

What brand and model of hearing aids are you wearing? Here is a link to a support page regarding CarPlay:

Use CarPlay with your iPhone - Apple Support