Why is gulp looping?

Question

css

Changing and saving a file watched by watch causes a browser refresh loop. In the console, the constant updating of prntscr.com/g2gjo2, after 30 updates, stops.
If at this moment you continue to make edits to the file, the sublime stupefies reacting that changes have occurred and asks to update them, after which the prntscr.com/g2gkct refresh continues anyway .
The day before, everything was updated correctly

var gulp 		= require("gulp"), //lib gulp
  browserSync = require("browser-sync"), //lib 4 browser reload and server
  csscomb		= require("gulp-csscomb"), //lib 4 lint css
  del			= require("del"); //lib 4 clean


// очистка папки dist
gulp.task('del', function(){
  return del.sync('dist');
});


//очистка рабочей папки app
// gulp.task('del-app', function(){
// 	del(['app/css/*.*','!app/css/style.css','app/fonts/*.*','app/img/*.*','app/js/*.*']);
// });


//сборка проекта
gulp.task('build', ['del','csscomb'], function(){
  var	buildcCss = gulp.src('app/css/**.css')
  .pipe(gulp.dest('dist/css'))

  var buildHtml = gulp.src('app/**.html')
  .pipe(gulp.dest('dist/'))

  var buildImg = gulp.src('app/img/**.*')
  .pipe(gulp.dest('dist/img'))

  var buildJs = gulp.src('app/js/**.*')
  .pipe(gulp.dest('dist/js')); 
});



//минификация стилей
gulp.task('csscomb', function(){
  return gulp.src('app/css/*.css')
    .pipe(csscomb())
    .pipe(gulp.dest('app/css/'));
});


//создание сервера для просмотра
gulp.task('browser-sync', function () {
  browserSync({
    server:{
      baseDir:'app'
    },
    notify:false,
    online:false,
  });
});


// слежка за изменением файлов
gulp.task('watch', ['browser-sync','csscomb'], function(){
  gulp.watch('app/css/*.css', ['csscomb']);
  gulp.watch('app/css/*.css', browserSync.reload);
  gulp.watch('app/*.html', browserSync.reload);
});