Strage horizontal lines

     Hello, I've bought a Macbook Air 13" 2013 and I am experiencing a strange behaviour:
Once in a while (it can be few times a day or one time in a few days) a screen-wide horizontal line appears. It looks like it is just misplaced line of pixels, the colors are similiar to the current content of the screen. After something changes on the screen, it vanishes. I had this both on OS X 10.8 and 10.9.
I can't make a screenshot because it dissappears when I try. It seems that this is system related (I didn't see lines during games or videos), but I am not sure.
Any advice would be appriciated.

The warranty entitles you to complimentary phone support for the first 90 days of ownership.
If you bought the product in the U.S. directly from Apple (not from a reseller), you have 14 days from the date of delivery in which to exchange or return it for a refund. In other countries, the return policy may be different. If you bought from a reseller, its return policy applies.

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