Small Engines (Lawn Mowers, etc.): craftsman professional blower, weird things, spark plugs

Question
I have a 28cc two cycle craftsman professional blower.  It starts great and runs great (at least for about 20 minutes).  I have had it just over a year and have loved it until the last three times I used it.  The first sign of a problem was when I held it vertical to blow webs off of my gutter and it cut out then would not restart.  It sounded as if it were not getting air.  It is easy to start and runs great for about 20-25 minutes then slowly dies sounding as if it ran out of gas.  This happens even if it is held horizontal during the entire time.

Answer
Will it restart when it cools?  If so, I'd start by replacing the spark plug as I have seen some spark plugs do weird things.

You can also check to see if the unit has spark when it stops running.  It is possible for ignition models to stop working when they heat up and then start working again when they cool down.

Let me know if a new plug helps and if you have spark when the unit stops running.

Eric