But that was misleading, because the clicking noise was what you complained about in the first sentence.
Then you can only try it with a different device and hope that it was due to the earlier version of the SU-1/firmware. There might not be a new firmware because something has changed in the hardware, and Shenzhen Audio doesn't want to spend money on a firmware update since all these devices have already been sold.
My D1 always follows the mouse click on the foot, whether starting or stopping. The moment I click, the music starts playing. Without any additional noise.