High Temp Cook, Pellet Hopper Issue

I love my Yoder YS640, Let me state that again, I LOVE LOVE LOVE my Yoder ys640
I have been using it for about three years. Last year I replaced the igniter. I have noticed that I have issues now with pellets in my hopper catching on fire during high heat (>300 degree burns does not happen during long smokes at 225 or less.). I have a video located here for your review...
https://youtu.be/oVW5-K_Cj6k
Before I dig into the unit, have YOU experienced this? If so, how did you solve it.
Could I have a reversed polarity on one of my fans?
Do I need to reseal the unit somehow?
Marc
I have been using it for about three years. Last year I replaced the igniter. I have noticed that I have issues now with pellets in my hopper catching on fire during high heat (>300 degree burns does not happen during long smokes at 225 or less.). I have a video located here for your review...
https://youtu.be/oVW5-K_Cj6k
Before I dig into the unit, have YOU experienced this? If so, how did you solve it.
Could I have a reversed polarity on one of my fans?
Do I need to reseal the unit somehow?
Marc