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LM3670 Stability

Other Parts Discussed in Thread: LM3670

I'm seeing instability in my circuit based on LM3670 1.8V.  Sometimes it comes up and it's oscillation decays. (yellow is input)


Other times it goes into oscillation:

Here is what my schematic looks like:

Here is my layout.  The white square is the outline of the inductor on the other side of the board.  There is a solid ground plane between the inductor (L5) and the parts show.

What could be causing this instability?