Hey guys my SI on my helix 10 mega is acting up. Up untill my last 2 trips out it has been crystal clear now Im not even finding the bottom at times. The setup has not changed or moved. Connections clean and secure. Plenty of power going to unit. Water was dirty but not even muddy. Changing the settings does nothing to improve the picture. Down imaging and 2d are clean and factory reset doesnt help. Thoughts?