SQ5 digital output but no analog output

We experienced this today and wondered if anyone can offer suggestions (or sympathy!).
We have had our SQ5 for about 4 years. We have digital (ethernet) links to two stage boxes and thence to powered monitor speakers from several auxiliary channel outs and also several analog outs to power amplifiers local to the desk. This morning we lost all analog outputs although the digital outputs were working as normal. In the heat of the moment, setting up for the morning service, it took a while to realise what had happened. All inputs, analog and digital, were working correctly. Investigating afterwards I did the “obvious last resort”; power down and restart and YES that fixed the problem in that it all worked properly. I am very worrried that it might happen again or is indication of an approaching failure. Has anyone experienced similar please? Any comments welcome. Thanks. Kim.