Interference issue

All the sudden my lowrance on bow mounted has small Diagonal lines on 2d. Never changed anything, just started on its own and hasn't stopped. Seems to get worse in evening and dark for some reason too. Any suggestions?

May be plankton and other stuff that floats in the water column that develops as the sun sets. Pretty common.

There's always interference on it. Just gets worse. All lakes I've been on. When first started was on squaw and guy I was with said it was cause of the lake. But since then it's always done it. That was February.

are you running two units at once on two different transducers?

Yes but every now and then I'll run front off rear to get down imaging when I'm trolling around docks to view down or side imaging

I would try turning one sonar off next time and see if that don't fix, sound like crosstalk between units. You could also if possible try running each unit on a different frequency, one on 83 and the other on 200