I bought an XD9 service model when they came out, and my friend bought the 5" "tactical". Mine had 5000+ rounds through it with no hiccups when it was stolen (my home was completely burglarized). My friends XD is still going strong.
I replaced mine with an XDM in .40 and that was another awesome gun.
I doubt there's anything wrong with your xd. Go try it again fresh and rested.