I didn't know that this was widespread. I guess for once I got lucky. Sorry you guys have these problems.
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From what I am reading on different forums, the problem does not appear to be widespread.
I think it was a certain batch of phones. My wife went through several to find one without a dead spot in the upper left of the touchscreen. (T-Mobile). There was also some weirdness going on with the display right at the very corner of several of the affected phones. Bad glue maybe?
The one she has now has zero issues.