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This sound has just recently happened in the past 2 days. Nothing significant happened in that time. No hitting potholes, no curbing, etc.
only Thing I can think of is the weather has been getting chillier the last week. Near the single digit (Celsius) now. Tire pressure is good, 230psi.

I first noticed it when going over road bumps, even at slow speeds. I thought it was the up and down movement of the tires that made the sound, but now it happens when moving tire side to side.

something to do with the suspension?