iphone 15 with iOS 17.4 now has a problem staying connected with bluetooth devices

I recently upgraded my iphone from an 11 to a 15. I updated both phones to iOS 17.4 before transferring my data from the old phone to the new one.

I use three bluetooth devices daily:

2015 Toyota Prius stereo

JBL Flip 5 Speaker

Raycon Everyday Earbuds

All three used to connect flawlessly with my iphone 11. Now they are all a pain in the rear, especially my car.

2015 Toyota Prius stereo

Does not discover my phone when I start the car. I wiped all the previous phones from it's registered devices and started fresh. The car indicates that my phone is registered, but I have to go back and forth between the car dash controls and the phone 2 or 3 times before it finally connects EVERY TIME I start the car. Maddening.

JBL Flip 5 Speaker / Raycon Everyday Earbuds

When I used to turn these on, they would automatically connect with my former phone. Now I have to tell my phone to connect to them manually. Not a big deal, but an annoying unnecessary step. The phone features both devices in my bluetooth list.

I'm really hoping Apple can fix these connectivity issues.