I am not very good when it comes to technical stuff for cars

I have a citroen c3 67 plate car. I have been having issue with this in regards to the radio.
For sometime now its not wanted to connect to bluetooth, so i have been using a usb to play music through my car and satnav.
The usb seems to funny as well as it will only connect to my car before i start the engine, if i drive just to the end of my road and a bit then try and connect it wont.
On the screen where it says radio, bluetooth, usb the only one that is white is Radio.
But when my phone is not attached to usb it says it is connected via bluetooth, you play something on my phone you cant hear it as its connected to the car but the car isnt playing what you phone is its playing the radio.
I have reset it back to factory settings, this seemed to work for 5 seconds, so i tried to connect usb to see if that worked - it kicked off bluetooth and now that wont come back, i reset it again and no luck.
Can someone help?