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@Gordon
How much power does the nRF905 draw? Maybe you could try putting a capacitor across the power lines to it.
Is anything hot on the Pico? The voltage regulator has over-temperature protection
There's also a polyfuse for overcurrent - is it possible that you connected the nRF905 to the 'Vout' pin of the Pico - which would be 13v? That would then massively over-volt the nRF905, which would probably put high voltages on the IO lines, which would go back into the Pico's STM32 and might also raise the voltage on the USB line. Finally the polyfuse would trip and cut the voltage - but it's self-resetting so it would just keep doing it over and over.