Pidog has no sound

I bought and installed the Pidog (some time ago).
As I told you before: initially I had sound: when starting up and when using the ‘function demonstration’.
But suddenly: no sound anymore. As this happened around the time I put straps around the wiring, I thought I damaged the speaker.
I then bought a new robot hat (complete with batteries), and I had sound.

But now, months later, I was making a list of cmd’s and everything was OK, but then: without starting up again or doing something new,
the sound disappeared. I then installed several times, but no sound.
I even installed Raspberry Pi 32 bit legacy on another card and installed everything over again, but no sound

Please find hereby a copy of the fault-screen when trying to make sound via ‘function demonstration’.

Can you help me ?