Background infinte loop starts shaking and blurry

[user_36d727b12efae535be2c2642a34a272d00d0455961c75d4402759d (卂尺ㄚ卂几)]

I created a background loop of image using panner,After running the game it runs smoothly but after some times its get totally blurry and it gets totall worse.

See the background in this image