Looping Back to setup after void loop() has run a random number of times

[DaveX]

I'm sorry I had it backwards, as if you wanted to invoke a random re-setup behavior.

One thing that causes a reset is executing a null function, and these pointer assignments look a little suspicious. What are you trying to do here?

@sweaterdog

  sensors_event_t temperature;
  sensors_event_t pressure;
  sensors_event_t accel;
  sensors_event_t gyro;
  //bmp_temperature->getEvent(&temperature);
  bmp_pressure->getEvent(&pressure);
  mpu_gyro->getEvent(&gyro);
  //mpu_accel->getEvent(&accel);

  if(groundLevelPressure == 0) {// Sets the permanent ground level
  groundLevelPressure = pressure.pressure;
  }

  seaAlt1 = 44330*(1-(pressure.pressure/1013.25));
  seaAlt2 = 1/5.255;
  seaAltitude = pow(seaAlt1, seaAlt2);

  Alt1 = newStandardCalc*(1-(pressure.pressure/groundLevelPressure));
  Alt2 = (1/5.255);
  Altitude = pow(Alt1,Alt2);

//Format more akined to the serial plotter / graphs
 ///*
  Serial.print(flightTime);
  Serial.print(",");

  Serial.print((temperature.temperature*9/5)+32);

I think 'temperature' might be zero or junk, and temperature.temperature might be something unexpected. Are you sure you are using all the references and pointers correctly?