Is it me...?

Is it me?  Lately, as I am responding to posts, I hit the submit button and ... nothing happens.  I wait and wait, then finally I get tired of waiting and hit the button again.  This time it works, great right?  Nope, now my comment is posted multiple times.  Very frustrating!  Any ideas (besides being patient)?

While I have your attention, I am also wondering what blogging etiquette is for comments.  I read so many great blogs, but by the time I get to them there are so many responses that anything I have to say is already said.  I truly want the author to know that I am reading (I read about 99% of all the blogs I follow), but don't want to sound like I am copying someone else or dumb.

I would love to hear if any of you have ideas on these subjects!  Are there etiquette rules for blogging?  Thank you for your responses!