attachment_fu and mysql

Hi folks,

I'm using attachment_fu to upload mp3 files to amazon s3. The files
are between 1 and 5mb each.

Mostly it works fine, but about 1 in 4 uploads will fail, and once an
upload fails the app responds erratically, returning proxy errors and
slowing down overall.

It's apache/mongrel, with mysql db. I'm watching the log scroll by as
I upload, and there are no errors thrown.

My only guess so far is that if the upload takes a while between
laptop to server and then server to amazon, mysql is vulnerable in the
meantime.

Any ideas on tracking this down, or on how to protect the db during a
longish update?

controller code follows

thanks much
          @news_story = NewsStory.find_by_id(params[:id])
          @news_story.update_attributes(params[:news_story])
          @news_story_soundclip =
NewsStorySoundclip.new(params[:news_story_soundclip])
          if @news_story.save
            @news_story_soundclip.news_story_id = @news_story.id
            @news_story_soundclip.save
            flash[:notice] = "Story changes saved."
            redirect_to :action => 'list'
          else
            redirect_to :action => 'edit', :id => params[:id]
          end