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TPA3122D2 speaker popping

Hi

I built the circuit in Fig. 28 of the datasheet on strip board. It all works fine, except when I turn it on. No sound comes through, only the speakers makes popping noises about once every second. This keeps going for a short while (otherwise indefinitely), then a big pop and the music start playing and everything works fine.

Any idea what might be wrong? What other info can I give?