Does any one have an idea about this, when I turn unit on , down imagining will work until getting to about 10 mph, then screen goes pretty much black with little dots every now and then, 2D sonar works fine. I believe it will be a transducer issue, but what would yalls opinion be. Unit is 2 years old 

If 2d is working above 10 then I don't think these is any issue, dv is used while going slow

^^^^^ I second this

I don’t think I explained correctly, after the down view goes black after speeding up, when I slow down it never starts working again, stays black until I cut off the unit and turn it back on, and then it don’t read correctly for long, but the 2D always works, Don’t read at faster speeds, but when I slow it goes right back to reading right,