me too
i have the same thing, along the top. on the third morning (today) phone wouldn't boot up (stuck on pineapple). i had to restore it, and this time it took two hours.
for a couple of months now, i've noticed that i sometimes have to hold home plus power in the morning to turn it on. once or twice a week, maybe. it's unnerving. i can live with the lines, but now i'm wondering just what's up with the phone. i've had it a year, restored it a lot, mess with the files and experiment a lot, and so on.
it's on maybe 15 hours daily, nearly every day since i bought it, so it gets a lot of use.