Nano Every Hanging after DigitalWrite

[6v6gt]

@mikeightley

void interruptHandler() {
  if (radio.available()) {
    radio.read(&Received, sizeof(Received));
    Serial.print(F("Received "));
    Serial.print(F(": "));
   . . .
   . . .
}

Serial.print in an interrupt service routine will cause unpredictable behaviour.
Set a (volatile) flag in the ISR and print an interpretation of it in the loop()