I recently received a Kenwood TF-721A that powers on but immediately begins "scanning" through all frequencies available in the 70cm. It doesn't actually stop on a strong signal, it just hits the end pf the band, beeps, and returns to the low end to start over. I've tried a soft reset by powering on while holding the F key. I will replace the memory battery soon to rule that out. If that doesn't work, what are your thoughts on what my next step should be?