Breakers are there to detect faults, so if you cannot diagnose anything you should get an electrician in to check that nothing is amiss.
Is there any possibility that there was a power cut, even just a very brief flicker or ‘brownout’? The inrush current to your big Naim power supplies could have caused a trip if they all powered up simultaneously.
I don’t have a dedicated circuit for the system but I do have separate circuit breaker boxes for other reasons. Sometimes, very occasionally, one of the individual switches on the main consumer unit clicks off, sometimes the whole unit switches off at its main switch.
I don’t get the other units going off at the same time and there’s no obvious internal cause but sometimes there is a flicker to the lights, the phone and printer tweet off and on, the fridge stops etc for a split second as if there was a surge or some external disruption. There’s no subsequent indication that this was caused by any kit in the house.