I have the first model of the Sportster in my car & I am wondering if it is time for a new radio. I have probably had it for about 3 years & had never had any reception problems. However, lately the radio works fine for about 5-10 minutes. Then the sounds just goes off. The usual 'Acquiring Signal' does not come up on the screen. The screen is still showing the song & there is just no sound. Then when I turn it off & then back on, it the says 'Acquiring Signal' & never does pick up a signal. The antenna does not appear to be damaged. Has anyone had this similar problem? Any suggestions or is it time for a new radio? Thanks.