Posted this in the Onix section, 100 views and no reply.
Onix 10 combo. Transducer mounted on transom of a Sportsman Masters 247. The unit will lose touch with the bottom and start displaying weird depth reading in the 1000s of feet. 2000-4000 is the range. Then the unit will crash. Go right to a black screen and need to be restarted.
If the unit was displaying a shallow reading with lots of clutter I'd suspect bad mounting/water flow. But it's the opposite.
Any ideas?