bluetooth goes on and off

As of yesterday, bluetooth on my Iphone 5 has been going on and off randomly. The only reason I noticed is that my phone is connected to my hands-free system in my car. Been working fine since Decmeber and then yesterdy I was continuously connected and disconnected in the car. When I look at my phone, I notice the bluetooth turning on and off. I don't think it is my vehicle since I can see it going on and off on my phone. Anything I can do, reset?