Took delivery of a new boat a few months ago. I have a TZT3 12" and 9" with a B265 transducer. It's seems like I'm getting a periodic average sea temp. Temperature will not move at all for around 15-20 minutes. I mean zero variation. It will then bounce around by a tenth or so for a couple minutes and go back to showing a constant temperature. Is this a setting I can adjust for more of a connection or transducer issue?