Gulp stops watching - web

Question

I'm using gulp to watch certain files and run certain tasks however after the first few runs it seems to stop watching. If I save html files in the pages directory, after the first two to five updates, the templates task seems to stop running. I've included my gulpfile below.
// Include gulp
var gulp = require('gulp');
// Include plugins
var jshint = require('gulp-jshint');
var sass = require('gulp-sass');
var notify = require('gulp-notify')
var htmlv = require('gulp-html-validator')
var swig = require('gulp-swig');
var plumber = require('gulp-plumber');
// Linting
gulp.task('lint', function() {
return gulp.src('js/*.js')
.pipe(jshint())
.pipe(jshint.reporter('default'));
});
gulp.task('sass', function() {
return gulp.src('./resources/scss/*.scss')
.pipe(sass()
.on('error', notify.onError(function(error) {
return 'Error: ' + error.message;
}))
)
.pipe(gulp.dest('./css'));
});
gulp.task('validate', function() {
return gulp.src('./**.html')
.pipe(htmlv({format: 'xhtml'}))
.pipe(gulp.dest('./validation_out'));
});
gulp.task('watch', function() {
gulp.watch('js/*.js', ['lint']);
gulp.watch('./resources/scss/*.scss', ['sass']);
gulp.watch('./pages/*.html', ['templates']);
});
gulp.task('templates', function() {
return gulp.src('./pages/*.html')
.pipe(swig({
load_json: true,
defaults: {
cache: false
}
}
))
.pipe(gulp.dest('.'));
});
gulp.task('default', ['lint', 'sass', 'templates', 'watch']);