Typically, the 4 things that would affect this most are Sensitivity, Contrast, Sharpness and Dynamic Contrast. On the Solix, Dynamic Contrast is an on/off switch at the top of the color pallet selection menu. Try playing with all 4 when you are seeing this to see what impact they have.

This morning I had a similar occurrence but one side of the SI was sloping up significantly and the other was sloping down significantly. I had the SI Sensitivity Offset at 0 so one side was brighter and the other was darker. The darker side has the same bright segments your image has.