I've had my Masterbuild vertical 2 door smoker for about 2 years now. Got the model only sold at Home Depot. It's been working great, but recently made took it from Kansas City to San Diego on a cross country move and have been having issues with the burner. For the first 3-4 hours the unit works normal. Then after a while the temp in the smokehouse starts dropping to about 140. When I went out to take a look it was getting dark and noticed the orange glow being seen under the unit on the ground. When I opened the bottom door I saw almost no blue flame at all. Turned off the gas and when I reignited it the flame became very large and actually came out below the burner and got very close to where the hose turns to the metal valve allowing the gas to mix with the air before reaching the burner for combustion. It's pretty rusty on the bottom so I'm guessing something is changing due to the heat over time. Maybe I need a new burner, but with the way it's built just from a glance it doesn't look very easily replaceable. The masterbuilt website doesn't list any replacement parts either. Has anyone experienced anything like this before with a vertical gas smoker?