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TPA3255EVM: output problem

Part Number: TPA3255EVM

Hi, I am using TPA3255EVM in PBTL Configuration(every  configuration is set according  to the EVM DATASHEET ).

When the input is a fixed value(single-ended input),such as AVDD/2, then I tesed  J9 outA ,outB which could see the 

sinusoidal disturbance as below:where  Channel 2 is outA; Channel 4 is outB

I tested that the input signal didn't have this sinusoidal disturbance. 

Also, when using continuous input signal such as  sinusoidal signal,Interfering signal of the above frequency  will be superimposed  in the the output sinusoidal signal .

What's wrong with it?