Today we had a second incidence of PAW Rosetta stopping working for no apparent reason. We have it connected to SD and suddenly SD showed it had lost gps position. The Trig transponder, which has gps input from PAW, also showed it had lost gps position. Switching PAW off (actually switching off the Charge 4 power supply that feeds PAW and several other things) and back on again restored gps to Trig but you then have to re-link it to SD, and reconnect igrid etc. which is not ideal to do in flight.
We also saw that when the Trig lost its gps input from PAW it didn’t function at all in any mode. Awkward as it happened in the middle of a zone transit and controller had to confirm which dot on his radar we were. Is that usual when a Mode S ES/ADS-B transponder loses its gps input then it doesn’t just revert to being a Mode S?
Any idea why PAW should suddenly cut out like that? Other than these two incidences of spontaneous shutdown it has worked really well and we love it! Many thanks. David