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LM5118 stability and "inductor audio ringing"

Other Parts Discussed in Thread: LM5118

Hi I am using the LM5118 DC-DC controller to generate +27V DC out, with an input of 18-34V.

I was able to setup the error compensation of the circuit so that I am able to output 4A without any problems.

However when I start pushing it above 5A-6A and the input voltage drops to 20V then there is an audible ringing on the inductor.

Both the input and output ESR is lower than calculated using the XLS design tool. The inductor's saturation current should not be reached (SER2918H-103KL).

When this ringing happens the outout 27V is still OK. 

My question is:

Should I be concerned? Will anything break in the longrun?  

See attached the voltage measured on the output of the buck mosfet and the inductor.