Got a new vogelzang this fall & so far pretty good. We usually clean it every day as our weather is still warm enough that we can shut it down during light for several hours. Well the last two times we cleaned it found pretty large clunkers in the burn pot & even some melted but not burnt pellets. This was after about 18 hour burns with unit on lowest setting. So I'm wondering if this is an indication that I need to open up the fresh air intake more or possibly just from the high humidity of the outside fresh air intake & the rain were in now. I'm using same pellet brand I have been using that was working good.