Constantly! Blue Rhino and Amerigas exchange services are horrible. I'd say on average 1 of every 15 I get are faulty. They always honor the replacement, but what a drag when you go to the trouble to get it and it doesn't work when you need it! Additionally, they only put 15# in their tanks as opposed to 20# when you have your tank filled. And here, you pay $22 for the junky, undependable exchange, and $18 when you refill your tank with more propane. Interesting.....