I've been using this thing for several winters. Problem I'm having is the pilot just started going out and kicking the heater off. It started doing this tonight. Burns about 5 minutes and then shuts off. I noticed after using a new 20lb. tank (first time used it) that instead of the usual pss I get when I disconnected the line, I got a pssssssssssssssssssssssssssssssssssss. Lots of fluid when I disconnected it. I was complaining to DW, "that one didn't last long", then when I picked it up it still felt like it had another day's worth of propane left in the tank. So I hooked up a full tank we've used several times already and it started kicking off every 5 minutes. I pulled the back cover off and cleaned what little dust there was around the venturis?? and re-assembled. Same problem. Pulled the extension line off the side with the valve shut @ the tank and lots of fluid again coming out of the line. Oh and one more thing I can think of, the tile itself is having difficulty lighting. I've always used low to get it lit. Now I'm having to turn it up to medium for it to light/catch and then turning it back down to low. What's the deal?