DAC+ DSP not working with Pi 3 or 4

Hi, I’ve just received a DAC+ DSP and am having trouble getting it to work with the 20200424 release of HiFiBerryOS. I flashed new images for my Pi 3b and 4b and tried the card in both. Initially the software recognises the card correctly and goes through the setup. After a while the web interface spontaneously reconnects and then on the main page the card is incorrectly identified as DAC+ Zero/Light/MiniAmp. After that it never recovers and seems to output everything at 48khz. Any clues what might be wrong? Jim


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