Eleven months ago I bought a Lowrance Elite 7 DI Combo at Cabela's - for the past 3 or 4 trips that unit would just go to a black screen. At times you could just power it back up and everything would be ok. Yesterday it seemed as though the unit would shutdown even more than before. I have not called Cabela's or Lowrance yet and not sure about the warranty. Any suggestions on how to troubleshoot or possible next step would be appreciated.