Show method does not change the image regularly!

Show method has some glitches! sometimes it works fine,sometimes it doesn't!

`<ngx-gallery #gallery  [options]="galleryOptions"
						[images]="galleryImages" class="ngx-gallery">
					</ngx-gallery>`

`colorChanged(color){
		let ind = this.coloritems.findIndex(col => col == color)
		this.gallery.show(ind);
	}`

I'm calling the show method inside the function!