Why does my 8x8 matrix stop displaying?

Hey guys,

I have an Espruino WiFi (love this thing) with an 8x8 matrix led display as recommended here. I have node-red running on my Raspberry PI 4. My Espruino makes calls every 3 seconds to my PI to get the current time and displays it scrolling across the matrix.

The problem is it just stops after about 10 minutes, I checked the Rasperry Pi and it is still being called by the Espruino every 3 seconds in the log. So the reason it's not displaying could be in this script somewhere, just not sure how to even debug it...

var WIFI_NAME = "BTHub-XXX";
var WIFI_OPTIONS = { password : "XxXxX" };
var http = require("http");

var output = 'default text';
var interval = false;

const ANODES = [B6,A7,A6,B9,A4,B8,B4,B3];
const CATHODES = [B0,B5,A0,B7,B10,A1,B1,A5];
var g = Graphics.createArrayBuffer(8,8,1);

var wifi = require("Wifi");

function onInit() {
  wifi.connect(WIFI_NAME, WIFI_OPTIONS, function(err) {
    if (err) {
      console.log("Connection error: "+err);
      return;
    }
    console.log("Connected!");
    getData();
    start();
    scroll();
  }.bind(this));
}


// Start scanning out the LED display
function start() {
  console.log('start');
  var b = new Uint8Array(g.buffer);
  // Pre-bind digitalWrites to make things faster
  var a = digitalWrite.bind(undefined,ANODES);
  var c = digitalWrite.bind(undefined,CATHODES.con­cat(ANODES));
  return setInterval(function() {
    b.map((d,i)=>{c(65280^(256<<i));a(d);});­c(65280);
  },10); // 100 Hz
}

function scroll() {
  var i = 8;
  if (interval)
    clearInterval(interval);
  
  interval = setInterval(function(){
    if(i == -(output.length * 4)) i = 8;
    g.clear();
    g.drawString(output, i, 2);
    i--;
  }, 100);
}

function getData() {
  setInterval(function(){
    http.get("http://192.168.1.146:1880/hell­o-data", function(res) {
      res.on('data', function(data) {
        output = data;
        console.log(output);
      }.bind(this));
    });
  }.bind(this), 3000);
}