Bangle.setLCDTimeout() question

Here's the latest code for arrow. I can reproduce the problem with this code. There is no use of g.flip(). flip1() and flip2() just draw buf1 and buf2 which are different sizes. I have also taken out the setLCDTimeout(30);

The LCD will only go of if the watch is totally still. I have disabled switch on on twist in the settings.

For simplicity I have taken out the calibrate functions in the code below.

var pal1color = new Uint16Array([0x0000,0xFFC0],0,1);
var pal2color = new Uint16Array([0x0000,0xffff],0,1);
var buf1 = Graphics.createArrayBuffer(128,128,1,{msb:true});
var buf2 = Graphics.createArrayBuffer(80,40,1,{msb:true});
var intervalRef;
var bearing=0; // always point north
var heading = 0;
var oldHeading = 0;
var candraw = false;
var CALIBDATA = require("Storage").readJSON("magnav.json",1)||null;

function flip1(x,y) {
  g.drawImage({width:128,height:128,bpp:1,buffer:buf1.buffer, palette:pal1color},x,y);
  buf1.clear();
}

function flip2(x,y) {
 g.drawImage({width:80,height:40,bpp:1,buffer:buf2.buffer, palette:pal2color},x,y);
 buf2.clear();
}

function radians(d) {
  return (d*Math.PI) / 180;
}

// takes 32ms
function drawCompass(hd) {
  if(!candraw) return;
  if (Math.abs(hd - oldHeading) < 2) return 0;
  var t1 = getTime();
  hd=hd*Math.PI/180;
  var p = [0, 1.1071, Math.PI/4, 2.8198, 3.4633, 7*Math.PI/4 , 5.1760];
  
  // using polar cordinates, 64,64 is the offset from the 0,0 origin
  var poly = [
    64+60*Math.sin(hd+p[0]),       64-60*Math.cos(hd+p[0]),
    64+44.7214*Math.sin(hd+p[1]),  64-44.7214*Math.cos(hd+p[1]),
    64+28.2843*Math.sin(hd+p[2]),  64-28.2843*Math.cos(hd+p[2]),
    64+63.2455*Math.sin(hd+p[3]),  64-63.2455*Math.cos(hd+p[3]),
    64+63.2455*Math.sin(hd+p[4]),  64-63.2455*Math.cos(hd+p[4]),
    64+28.2843*Math.sin(hd+p[5]),  64-28.2843*Math.cos(hd+p[5]),
    64+44.7214*Math.sin(hd+p[6]),  64-44.7214*Math.cos(hd+p[6])
  ];
      
  buf1.fillPoly(poly);
  flip1(56, 56);
  var t = Math.round((getTime() - t1)*1000);
  LED1.write((t > 100));
}

// stops violent compass swings and wobbles, takes 3ms
function newHeading(m,h){ 
    var s = Math.abs(m - h);
    var delta = (m>h)?1:-1;
    if (s>=180){s=360-s; delta = -delta;} 
    if (s<2) return h;
    var hd = h + delta*(1 + Math.round(s/5));
    if (hd<0) hd+=360;
    if (hd>360)hd-= 360;
    return hd;
}

// takes approx 7ms
function tiltfixread(O,S){
  var start = Date.now();
  var m = Bangle.getCompass();
  var g = Bangle.getAccel();
  m.dx =(m.x-O.x)*S.x; m.dy=(m.y-O.y)*S.y; m.dz=(m.z-O.z)*S.z;
  var d = Math.atan2(-m.dx,m.dy)*180/Math.PI;
  if (d<0) d+=360;
  var phi = Math.atan(-g.x/-g.z);
  var cosphi = Math.cos(phi), sinphi = Math.sin(phi);
  var theta = Math.atan(-g.y/(-g.x*sinphi-g.z*cosphi));
  var costheta = Math.cos(theta), sintheta = Math.sin(theta);
  var xh = m.dy*costheta + m.dx*sinphi*sintheta + m.dz*cosphi*sintheta;
  var yh = m.dz*sinphi - m.dx*cosphi;
  var psi = Math.atan2(yh,xh)*180/Math.PI;
  if (psi<0) psi+=360;
  return psi;
}

function reading() {
  var d = tiltfixread(CALIBDATA.offset,CALIBDATA.scale);
  heading = newHeading(d,heading);
  var dir = bearing - heading;
  if (dir < 0) dir += 360;
  if (dir > 360) dir -= 360;
  drawCompass(dir);  // we want compass to show us where to go
  oldHeading = dir;
  buf2.setColor(1);
  buf2.setFontAlign(-1,-1);
  buf2.setFont("Vector",38);
  var course = Math.round(heading);
  var cs = course.toString();
  cs = course<10?"00"+cs : course<100 ?"0"+cs : cs;
  buf2.drawString(cs,0,0);
  flip2(90, 200);
}

function startdraw(){
  g.clear();
  g.setColor(1,1,1);
  Bangle.drawWidgets();
  candraw = true;
  intervalRef = setInterval(reading,500);
}

function stopdraw() {
  candraw=false;
  if(intervalRef) {clearInterval(intervalRef);}
}

function setButtons(){
  setWatch(()=>{load();}, BTN1, {repeat:false,edge:"falling"});
  setWatch(Bangle.showLauncher, BTN2, {repeat:false,edge:"falling"});
}
 
Bangle.on('lcdPower',function(on) {
  if (on) {
    startdraw();
  } else {
    stopdraw();
  }
});

Bangle.on('kill',()=>{Bangle.setCompassPower(0);});

Bangle.loadWidgets();
Bangle.setCompassPower(1);
startdraw();
setButtons();