I am currently in Custer State Park and we had some early snow. I was running my heater for 2 days and all was well. My propane bottle on the off door side ran out and I switched to the other bottle on the door side. I pulled the lever from the right to the left and opened the knob on the bottle. My heater now comes on for a min and then shuts off. I checked the burners on the stove and they will light but they too now turn off in less than a min. (the stove was working fine b4 also) I turned the knob on the propane bottle off and then unhooked the hose from the bottle and heard the woosh and smelled propane. I reconnected the hose and SLOWLY opened the knob. They problem still persists. Heater and stove will work for a min and then shut off. This must indidcate that the flow of propane has a problem. I am sure that it is a full bottle. I have a gage on it that reads full. I also and heard the woosh and smelled the propane when I unhooked the hose. I reopened it slowly so as not to get a vapor lock. What am I doing wrong?