I had similar happen last year.
Here's a thread that I did at the time .......
http://www.quiltingboard.com/main-f1...m-t283188.html
When I went to the LQS, theonly answer I got at the LQS was that it was too old.
I would possibly have accepted it ....... if it happened right from when I started using it. However, being that it had worked for a few uses (see the thread), I was not happy with that as the answer.
In the end the LQS, gave me 1/2 off on a new can. I thought that was fair, knowing that they could have just said, tough!
Since then, I have heard that the propellant in the cans only last so long .... so perhaps there was enough there for me to use the first few times without problems and then it was somewhat "defunct" when I went to use it the next time.
Good Luck!