Lowrance AirMap 300 Issue...

My GPS keeps losing it's mind. On my trip back from California a couple
weeks ago, and then on my last trip down to Shreveport, LA last week, my
AirMap 300 loses it's position and goes into a cold start. Sometimes it
picks up again, sometimes not. On the way down to Shreveport, I left it in
the cold start for a little over an hour. Suddenly, out of nowhere, it
finds itself again and is perfectly happy for a while. Then, it's back to
Cold Start. Sometimes powering down and back up help, sometimes not. It's
getting to be pretty annoying. Does anyone know if this is a problem with
the AirMap, or if there's a fix for it (short of buying another GPS)?
Thanks!

Chris