Always on seconds freeze after two minutes

Dear Garmin Developers,

I am working on a new watch face and I would like to implement always on seconds by using onPartialUpdate(). I implemented the code so far, but for some reason, the seconds freeze after two minutes. Can someone help? Heres the code:

using Toybox.WatchUi;
using Toybox.Graphics;
using Toybox.System;
using Toybox.Lang;
using Toybox.Application;
using Toybox.Graphics as Gfx;
using Toybox.System as Sys;

class OneHerzTestView extends WatchUi.WatchFace {

    function initialize() {
        WatchFace.initialize();
    }

    // Load your resources here
    function onLayout(dc) {
        setLayout(Rez.Layouts.WatchFace(dc));
    }

    // Called when this View is brought to the foreground. Restore
    // the state of this View and prepare it to be shown. This includes
    // loading resources into memory.
    function onShow() {
    }

    // Update the view
    function onUpdate(dc) {
        // Get the current time and format it correctly
        var timeFormat = "$1$:$2$";
        var clockTime = System.getClockTime();
        var hours = clockTime.hour;
        if (!System.getDeviceSettings().is24Hour) {
            if (hours > 12) {
                hours = hours - 12;
            }
        } else {
            if (Application.getApp().getProperty("UseMilitaryFormat")) {
                timeFormat = "$1$$2$";
                hours = hours.format("%02d");
            }
        }
        var timeString = Lang.format(timeFormat, [hours, clockTime.min.format("%02d")]);

        // Update the view
        var view = View.findDrawableById("TimeLabel");
        view.setColor(Application.getApp().getProperty("ForegroundColor"));
        view.setText(timeString);
        
        // Call the parent onUpdate function to redraw the layout
        View.onUpdate(dc);
        
        DoSeconds(dc);
    }

    function onPartialUpdate(dc) {
		DoSeconds(dc);
    }
    function DoSeconds(dc) {
   		dc.setColor(Gfx.COLOR_BLACK, Gfx.COLOR_TRANSPARENT);
    	dc.fillRectangle(160, 110,35,20);
    	dc.setColor(Gfx.COLOR_WHITE, Gfx.COLOR_TRANSPARENT);
    	dc.drawText(160, 120,0,":"+Sys.getClockTime().sec.format("%02d"), 2 | 4);
    }

    // Called when this View is removed from the screen. Save the
    // state of this View here. This includes freeing resources from
    // memory.
    function onHide() {
    }

    // The user has just looked at their watch. Timers and animations may be started here.
    function onExitSleep() {
    }

    // Terminate any active timers and prepare for slow updates.
    function onEnterSleep() {
    }

}

Thanks a lot.

Greetings,

GreanBean.