Pixel errors and display reset

Subject of the issue

Problems with pixel errors after an undefined period of time.

Your Environment

Library Version:3.7.1 Arduino IDE version:1.8.19 Host OS and Version:? CPU Hardware model/type: MEGA 2560

Steps to Reproduce

Display works without problems at first. After a longer time, there are pixel artifacts. Mostly in the lower rows. I have attached a picture.

20231023_112528

Expected Behaviour

The present code reads a lidar sensor and shows the result on the display. The values of the sensor are intended for level determination of a ton. If the signal of the lidar is too low, "Signal!" is displayed; if the signal is good, the fill level of the ton is displayed as a percentage value. If the ton is overfilled, "Error!" and every second LED flashes alternately.

Actual Behaviour

After a undefined period of time random leds are shining. Mostly last row. I've tried several things to avoid that behaviour. When the microcontroller is reset, the pixel errors are gone. Therefore I tried to find a way to reset the display in a certain time interval in the code. The function for this is attached.

Code Demonstrating the Issue

// Percentage
void displayMessage(int inpPercentage) {
  static char message[BUF_SIZE];
  static char lastMessage[BUF_SIZE] = "";

  itoa(inpPercentage, message, 10);
  strcat(message, " %");

  if (strcmp(message, lastMessage) != 0) {  
    mx.displayClear();
    mx.setTextAlignment(PA_CENTER);
    mx.write(message);
    strcpy(lastMessage, message);    
    Serial.print("Schreibe Wert: ");
    Serial.println(inpPercentage);
  }

// Signal
mx.displayClear();
mx.setTextAlignment(PA_CENTER);
mx.write("Signal!");

// Error (blinkstate is changed every second by timer interrupt
mx.displayClear();
if (blinkstate) {
        mx.setTextAlignment(PA_CENTER);
        mx.write("Fehler!");
 } else {
        //to light all the LEDs
        for (uint8_t device = 0; device < MAX_DEVICES; device++) {
          for (uint8_t row = 0; row < 8; row++) {
            for (uint8_t col = (row % 2 == 0) ? 0 : 1; col < 8; col += 2) {
              mx.getGraphicObject()->setPoint(row, device * 8 + col, true);
            }
          }
        }
      }
}

// Display reset (every minute)
void resetDisplay(){
  mx.displayShutdown(true);
  delay(100);
  mx.displayShutdown(false);
}

I hope someone can help! Thanks a lot! :)

MajicDesigns / MD_Parola