"A open wound," and "a optional stock"

This drives me crazy.  Batty!  What the heck is going on with people dropping the "n" when combining two vowels?! "All this proved to be a excellent source of information."  Ouch on the ears! These phrases were spoken by an otherwise highly-educated person! It's heard pervasively throughout the English lexicon nowadays.  It's AWFUL.  It's not cool!