iPad Dead Pixel Issue

[unixfool]

First iPad 16 GB wifi noticed dead/stuck pixel less then a week after purchase; seemed to appear magically from nowhere so I took it back to Wal-Mart (they sell Apple products in my area) and exchanged it for another one. This time, the first thing I did was the dead pixel test with the W R G Y B background and iPad was fine. Then updated to latest software, 4.2, and then noticed a dead pixel! This was all on the same day. First iPad didn't have a dead pixel until after update too. Anyone else notice this or is this just a coincidence or do you think Wally World just got a bad shipment? I was thinking about downgrading back to old software to see if dead/stuck pixel disappears?

Coincidence.