433 MHZ Receiver losing connection

Using Arduino Networking, Protocols, and Devices
1

Hi,
I am new to this forum so I hope this is the right place.

I have a thermometer which sends Oregon data to the base station. I used an Arduino Nano together with an RXB6 Receiver to get the signal and display it on an Adafruit 7 segement i2c display, which worked quite well.
Unfortunatly, it randomly stops receiving data. As a workaround I restart the Arduino programmatically and it continues working afterwards but this does not seeme like an elegant solution to me.

This is the code I am using. The oregon library is the one by Mickael. (GitHub - Mickaelh51/Arduino-Oregon-Library: To decode data from Oregon Sensors)

#include <Wire.h>
#include <Adafruit_GFX.h>
#include "Adafruit_LEDBackpack.h"
#include <SPI.h>
#include <EEPROM.h>
#include <Oregon.h>
#include <avr/wdt.h>

#define MHZ_RECEIVER_PIN 2
#define MHZ_VIN_PIN 4

Adafruit_7segment matrix = Adafruit_7segment();
unsigned long last_reception = 0L;
int connectionLostCounter = 0;

void softwareReset() {
  asm volatile ("  jmp 0");  
}

void setup() {
  attachInterrupt(digitalPinToInterrupt(MHZ_RECEIVER_PIN), ext_int_1, CHANGE);
  pinMode(MHZ_VIN_PIN, OUTPUT);
  digitalWrite(MHZ_VIN_PIN, HIGH);

  EEPROM.get(5, connectionLostCounter);
  if (connectionLostCounter < 0) {
    connectionLostCounter = 0;
    EEPROM.put(5, connectionLostCounter);
  }
  
  matrix.begin(0x70);
  
  matrix.setBrightness(1);

  matrix.print(connectionLostCounter);
  matrix.writeDisplay();
  delay(1000);
  
  matrix.writeDigitRaw(0, 0B01000000);
  matrix.writeDigitRaw(1, 0B01000000);
  matrix.writeDigitRaw(3, 0B01000000);
  matrix.writeDigitRaw(4, 0B01000000);
  matrix.writeDisplay();
  delay(500);
}

void loop() {
  
  cli();
  word p = pulse;
  pulse = 0;
  sei();
  if (p != 0)
  {
      if (orscV2.nextPulse(p))
      {
          const byte* DataDecoded = DataToDecoder(orscV2);
          int SensorID = FindSensor(id(DataDecoded),1);
          float temp = temperature(DataDecoded);
          printTemp(temp);
          if (battery(DataDecoded) == 10) {
            doubleBlink(temp);
          }
          last_reception = millis();
      }
  } else {
    if (millis() - last_reception >= 300000) {
      EEPROM.put(5, connectionLostCounter + 1);
      softwareReset();
    }
  }
}

void doubleBlink(float temp) {
  char tempString[6] = "";
  dtostrf(temp, 6, 2, tempString); 
  matrix.writeDigitNum(3, tempString[2] - '0', false);
  matrix.writeDisplay();
  delay(1000);
  matrix.writeDigitNum(3, tempString[2] - '0', true);
  matrix.writeDisplay();
  delay(1000);
  matrix.writeDigitNum(3, tempString[2] - '0', false);
  matrix.writeDisplay();
  delay(1000);
  matrix.writeDigitNum(3, tempString[2] - '0', true);
  matrix.writeDisplay();
  delay(1000);
}

void printTemp(float temp) {
  char tempString[6] = "";
  dtostrf(temp, 6, 2, tempString);    
  temp < 0 ? matrix.writeDigitRaw(0, 0B01000000) : matrix.writeDigitRaw(0, 0);
  abs(temp) >= 10 ? matrix.writeDigitNum(1, tempString[1] - '0') : matrix.writeDigitRaw(1, 0);
  matrix.writeDigitNum(3, tempString[2] - '0', false);
  matrix.writeDigitNum(4, tempString[4] - '0');
  matrix.writeDisplay();
  delay(1000);
  matrix.writeDigitNum(3, tempString[2] - '0', true);
  matrix.writeDisplay();
  delay(500);
}

Any help would be appreciated. Thanks in advance
Moritz