Thanks for the quick response, Shahid! The tv is 5 years old, and when the issue started (approx 6 months ago) it would keep a normal picture with little to no blurring at all.
As time has gone by, the period of time it takes the tv for the veritcal lines to disppear is longer, and the blurring has occured, and appears to stay longer.
For example, last night, the tv blurred all night, and it was on for at least 6 hours.
Today, the blurring eventually went away and it appears to be keping a normal display