or for between 31 and 90 days (for refurbished devices) and you believe it is defective, you may be eligible for our Online Warranty Exchange program.
There's your keywords... "may be".
Personally, I agree with the above. The hardware is not defective... likely moisture damage to the keyboard.
You're working the system (and well, I might add). Eight replacements is absurd, and apparently AT&T sees through it.