Jensen cd stereo

I have a similar problem with a Rockford Fosgate MP3 deck. Mine will get FM just fine (about half the time) when you first start the car, but over the course of a few minutes, the signal will break down until there is nothing. The other half of the time, nothing from startup on. Try this, at least; pull the unit and make sure the antenna is hooked up and secure. If that's not the problem, I haven't been able to find anything else, but a few other report the same thing. It might just be time to buy a new unit.