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AMP+ voltage spikes on start and end och playing

Hi, I get these voltage spikes at the beginning and end of playing a wav file. It appears that the AMP+ is activated as there is audio input from the pi and deactivated as it ends. Is there some way I can set the AMP+ to always be activated to avoid these spikes? Any other solution is of course welcome :)

The scope output from the attached album is from playing a wav file containing only silence. The system is running on a bench power supply at 20V.

https://ibb.co/album/c53S6F

Thanks

 // Thorbjörn

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