IPhone 4 Bluetooth automatically "going to sleep", won't wake up until bluetooth is cycled on/off

Hey guys,
I've had this problem for a while, but just recently it's been getting more and more frustrating.
I have an iPhone 4, and whenever I get into my car, my car will automatically search for the iphone to connect to. Now, normally this is great! Except that, after a few hours of non-use, my iPhone's bluetooth connection will require that I either A. Click on the car's bluetooth profile in the bluetooth menu to "wake up" the bluetooth (which involves the phone automatically cycling bluetooth on and off) or B. Manually turning bluetooth on and off.
Is this normal? I thought that if I left bluetooth "on" it would be waiting for a connection and would activate automatically when something was trying to pair with it. Any insight?

Anyone?

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