Using dynamic contrast will help a lot with it. It’s the beginning of the thermocline starting to break up.mega is finicky in the respect it picks up everything in the water.
I'm not sure, seemed strange to me too, but I don't understand why it wasn't there 2 weeks ago and now all of a sudden its always on my screen. I would love to have my clear images back again.
do you have grass in your lake? I doubt it grew that much over the span of 2 weeks but its a possibility. Also check to make sure you are getting good voltage to your unit. its amazing how much that can affect the image
Doesn't really matter in four foot ;)
Does it do it in deeper water?
Water temp?
Are you fishing different time of day than you were?
I would say a water changing issue.
In Virginia our thermocline has gone from a summer 12' to about 18' now. Has not turned over yet.