I have a Mitsubishi Gallant-2004. Just recently, while driving, the car radio will cut out then come back on. After about a minute of doing this it will stop working completely. Lights do not dim, car seems to run ok. However when I park and turn the car off it will not start again. I put a new battery in. A week later it does the same thing. This time I let the car sit for a couple of hours and it started. The car sat for a couple of days and the next time I drove it, it did the same thing. This did start happening after filling the gas tank. Any ideas as to what is causing this?