Well... I haven't bought one yet.
I generally don't race out and buy something in it's first production months, just in case there is a glitch somewhere.
The only exception to that rule was the First Gen iPad.
A true game changer, I HAD to get one immediately.
Which got me the unlimited data plan via ATT, which I still have, as long as I keep the bill paid.
So, no regrets there, and I had no issues with that first iPad, either. 🙂
I just posted that up as a try at offering something that might be optimistic, yet pertinent to the discussion, as there have been yellow screen issues before. It was offering a possibility.
It wasn't actually aimed at provocation.
As for adhesive drying and clearing;
There are many substances that change molecularly as they dry and/or heat.
Colours can change then.
Try sandwiching some elmer's between two plates of glass smashed together and watch what happens over time.
Is an iPad TRULY a vacuum? It certainly does heat, somewhat...
Anyway, just a thought from somebody who hasn't yet raced out to buy a first production.
Truly hope your situation gets better.