Sodaq Sara AFF Low Temperature

Hello

I have a sodaq Sara outside in low temperature.

The code sets the RGB led to Yellow, then calls this snippet

Wire.begin();

accelerometer.rebootAccelerometer();
delay(1000);

accelerometer.enableAccelerometer(Sodaq_LSM303AGR::LowPowerMode, Sodaq_LSM303AGR::HrNormalLowPower10Hz, Sodaq_LSM303AGR::XYZ, Sodaq_LSM303AGR::Scale2g, true);
// Enable the Accelerometer, in2 G (default)
pinMode(ACC_INT_PIN, INPUT);


// Enable interrupts on the SAMD
GCLK->CLKCTRL.reg = GCLK_CLKCTRL_ID(GCM_EIC) |
GCLK_CLKCTRL_GEN_GCLK1 |
GCLK_CLKCTRL_CLKEN;

float threshold =  0.5;		



pinMode(GPS_ENABLE, OUTPUT);
digitalWrite(GPS_ENABLE, HIGH);

#if (GPS_INTERFACE == WIRE_BUS)
Wire.begin();
#elif (GPS_INTERFACE == SERIAL_BUS)
GPS_STREAM.begin(GPS_BAUD);
#endif

Had this been successful, the LED would have been blue
At the globals, i have #define ACC_INT_PIN ACCEL_INT2 and GPS_ENABLE is also defined.

So alltogether, normally, this works without a problem.

But in the night the board was left outside for testing qand the temperature went below zero. Then the board went to sleep.

This morning, the temperature was 4°C, and after waking up, the board was unable to execute this snippet (hanged in one of these functions)

What is the cause, and what is the remedy.