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?