iPhone 6 text size issue

I have my text size jacked up very high so I can read sms and emails without glasses. I notice that on the iphone 6, if I compose a long text message, the bottoms of certain letters, the "Y" in particular, begin to dip out of sight below the keyboard after a certain point.



This did not happen on my iphone 4. Why is it happening now, and can I fix it?



Thanks!

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