.. I tried turning off screen trace and lowering reflections and its still happening in 5.6, this worked in previous versions.
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That doesn’t look like reflections to me, because the streaks also cover the sail.
These look like deliberate wind effects or speed lines.
Are you using some marketplace content that might have that effect built in?
Is that single layer water?
I managed to get rid of those flashing streaks by temporarily tweaking the Lumen view distance:
Right after loading the level
It only happens for me on render, let me try messing with lumen distance view, thanks!
its not some kind of speed effect on the water, it happens all over the scene I had this problem before and turned reflections down to epic and it went away (in 5.3).
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I see it now, much better pic.
I think you may also have the flickering I experienced though…
The critical thing is to set it, and then back, almost immediately.
Although, it does look like you have something else going on there…
You might try tinkering with AA method, or turning off TSR.
Thanks I think you pointed me in the right direction, this seems to have fixed my issue and I only have a vague understanding as to why lol.
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Great 
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