Gas oven won't stay lit..

I made a post recently about some propane appliances in my RV worked others didn't work. I pulled out my gas range and took it back several times. I was furious with the dealer. The dealer finally put it on the bench and showed me there was nothing wrong with my gas range. I finally had the pressure of my regulator checked. It was low. (pressure was checked by propane dealer) The rest of the appliances worked OK. They could not increase the pressure in the regulator. Apparently bad propane or just a defective regulator. Most propane dealers can check the pressure and adjust your propane regulator. Some RV dealers are just parts replacement jockies.