Closing windows in tabgroup stack causes a black screen to flash. How to get rid of it?

I am using the code below and it works, with one problem the screen flashes black when there are more than 2 levels that need to be closed.

//WindowController.js
var controller = {};
 
var windowStack = [];
 
//get array of windows
controller.appWindows = windowStack;
 
//create window
controller.createWindow = function(instance) {
    //hack - setting this property ensures the window is "heavyweight" (associated with an Android activity)
    instance.navBarHidden = false;
    //hack - setting this property ensures the window gesture is only PORTRAIT
    instance.orientationModes = [Titanium.UI.PORTRAIT];
 
    //This is the first/root window
    if (!windowStack.length) {
        instance.exitOnClose = true;
    }
 
 
    var win = Ti.UI.createWindow(instance);
    windowStack.push(win);
 
 
    win.addEventListener('close', function(e) {
        //Window Manager... manipulates the array of windows
        windowStack.concat([]);
        for (var i = 0; i < windowStack.length; i++) {
            if (windowStack[i].winName == win.winName) {
                windowStack.splice(i, 1);
            }
        }
    });
    return win;
};
 
//go to root/home window
controller.windowHome = function() {
    for (var i = windowStack.length; i > 1; i--) {
        windowStack[i - 1].close();
    }
};
 
//close window
controller.closeWindow = function(thisWindow) {
    for (var i = windowStack.length; i > 1; i--) {
        if (windowStack[i - 1].winName == thisWindow) {
            windowStack[i - 1].close();
        }
    }
};
 
//Redirect to window
//only existing windows are shown
controller.winLocation = function(thisWindow, args) {
    for (var i = 0; i < windowStack.length; i++) {
        if (windowStack[i].winName == thisWindow) {
            windowStack[i].close();
        }
    }
    args.concat({
        backgroundColor: '#ffffff',
        winName: thisWindow
    });
    var win = exports.createWindow(args);
    win.open();
};
 
//close window group
controller.closeWinGroup = function(thisGroup) {
    for (var i = windowStack.length; i > 1; i--) {
        if (windowStack[i - 1].winGroup == thisGroup) {
            windowStack[i - 1].close();
        }
    }
};
 
//if window exist
controller.isWinExist = function(thisWindow) {
    var exist = false;
    for (var i = windowStack.length; i > 0; i--) {
        if (windowStack[i - 1].winName == thisWindow) {
            exist = true;
        }
    }
    return exist;
};
 
module.exports = controller;