I was having a hard time keeping it lit the first few times I used it, I was using the pellets that came with it and had tried it in my SMO55 and on my Traeger grill. It would go out in 10-20 minutes every time.
The first time I had success was when I tried different pellets (Cookshack Hickory) and burned it in the FEC120. So I assume its the pellets that came with it, I did notice when I was lighting it that some moisture would ooze out. I did not notice this with the Cookshack pellets
I put it on the bottom shelf and never opened the door until it quit smoking over 13 hours later.