It worked great for about 2 hours after install, anchored, started night fishing with a light, turned back light down for a few minutes then turned unit off to save batteries. When I turned it back on screen went to elite lowrance and locked up wont even power off. Have to unplug power cord to kill it. Am I doing something wrong? Its Saturday and customer service is closed. Sure would like to play with it some more this weekend. Help Please

