Support bluetooth

I know this topic comes up a lot, but I can't seem to find my particular problem, or how to resolve it.

I have a 2011 Subaru outback that came equipped with*BT. I used to have a Motorola Droid that connected to my*BT*flawlessly. This is not the case with my Samsung Galaxy S4.

When I set up the*BT*in the car to pair with the phone all goes well and the phone pairs and connects to the car's*BT. However, when I turn the*BT*off on my phone the problem starts. When I then turn the phone's*BT*back on it says it is paired with the car's*BT*but it isn't connected. When I touch the*BT*"carmedia" tab on the phone it says "connecting..." but it does not connect. If I unpair the "carmedia" from the phone and go through the whole set up again (from the car- choosing "pair phone") then everything works fine. But the minute I turn off the*BT*from the phone then I can't get BT*connected unless I go through the whole pairing process from the beginning.
I have deleted all phones from my car's*BT*memory- this seemed to reset my car's*BT*to the first time I turned it on (the car will say "welcome to blue tooth..."). This did not resolve the problem.
Any help is greatly, greatly appreciated. I like the ability to turn my*BT*on and off on my phone when I want.
If this helps my phone is a wireless hotspot. But I have unchecked the box that says only pair to visible devices. And I am not using the wifi feature.*
Alty