Changes are sometimes not saving with sublime/gulp - sass

Question

I have a wordpress installation and creating a theme based on a lynda.com tutorial (WordPress: Building Themes from Scratch Using Underscores).
I installed gulp and all the needed stuff to work with scss but the problem is sometimes, changes don't save!
http://prntscr.com/o60i1a
the file is changed and watch is starting but the scss file is not updating.
The problem is sometimes it works when I close cmd or browser!
I read in another question here that you need to add this to sublime:
"atomic_save" : true
I did it, and it worked so changes are now saving okay (I was happy) but this mourning it's not saving again : (
Gulpfile.js:
var gulp = require('gulp'),
// Prepare and optimize code etc
autoprefixer = require('autoprefixer'),
browserSync = require('browser-sync').create(),
image = require('gulp-image'),
jshint = require('gulp-jshint'),
postcss = require('gulp-postcss'),
sass = require('gulp-sass'),
sourcemaps = require('gulp-sourcemaps'),
// Only work with new or updated files
newer = require('gulp-newer'),
// Name of working theme folder
root = '../' + themename + '/',
scss = root + 'sass/',
js = root + 'js/',
img = root + 'images/',
languages = root + 'languages/';
// CSS via Sass and Autoprefixer
gulp.task('css', function() {
return gulp.src(scss + '{style.scss,rtl.scss}')
.pipe(sourcemaps.init())
.pipe(sass({
outputStyle: 'expanded',
indentType: 'tab',
indentWidth: '1'
}).on('error', sass.logError))
.pipe(postcss([
autoprefixer('last 2 versions', '> 1%')
]))
.pipe(sourcemaps.write(scss + 'maps'))
.pipe(gulp.dest(root));
});
// Optimize images through gulp-image
gulp.task('images', function() {
return gulp.src(img + 'RAW/**/*.{jpg,JPG,png}')
.pipe(newer(img))
.pipe(image())
.pipe(gulp.dest(img));
});
// JavaScript
gulp.task('javascript', function() {
return gulp.src([js + '*.js'])
.pipe(jshint())
.pipe(jshint.reporter('default'))
.pipe(gulp.dest(js));
});
// Watch everything
gulp.task('watch', function() {
browserSync.init({
open: 'external',
proxy: 'localhost/wp',
port: 8080
});
gulp.watch([root + '**/*.css', root + '**/*.scss' ], ['css']);
gulp.watch(js + '**/*.js', ['javascript']);
gulp.watch(img + 'RAW/**/*.{jpg,JPG,png}', ['images']);
gulp.watch(root + '**/*').on('change', browserSync.reload);
});
// Default task (runs at initiation: gulp --verbose)
gulp.task('default', ['watch']);