Are the vertical lines different colors?
How long have you owned the TV?
The vertical striping is normally caused by a defective T-Con board, a defective LCD panel or a loose connection on one of these. A poor solder connection will often cause intermittent problems. Sooner or later the problem will continue all the time until it is fixed. The T-con board used to be considered unrepairable but Sony has now made the parts available and have issues a service bulletin on the repair. If the LCD panel has become defective the repair will cost more than a new TV will coat. Using the information you provided I expect the problem is a poor solder connection. T-Con board repair or the poor solder connection, loose connection should cost $350 or less.
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