I've had this board for around 3 years, it's been intermittantly failing during that period. It will simply stop outputting audio randomly (no power outage, nothing done to it at all). I could get it working again by running "apply-rew-filters" again, but the last time that didn't work - was saying zero slots available.
I have now set up a fresh install of HiFiBerry OS (Pi 3). The dsp page shows the screens below. The board had the "noautomute" xml installed on there initially. Installing either of the universal ones listed makes no difference - the UI shows "unknown" still and I cannot apply the REW filters - "16 filters given, but filter bank has only 0 slots".
Should I just accept that the board is defective and bin it?