Okay, problem number one:
The string players get really lazy in the second phrase and decide that two tied whole notes are too long to hold out. Why is it doing this, and how can I fix it?
Second problem is a real mystery to me. It is the mysterious buzzing noise about 34 seconds into it piece (after the crescendo). I really have no clue what that is or what is making it. No instrument has a note on beat 3 of that measure.