Hi cyber, reason the wood goes out is there is no air flow to keep it going.
There are ways to fix this issue, one is to install four air nozzles (90 degree bend in them) in the bottom of the chamber. This is one mode I did and works great for this issue.
Another way is to use pellets and get them going good before you turn the temp down.
OR you can try this way, get a small piece of screen (stainless steel) sorta bend it in a way as to keep the wood or pellets off the bottom (air flow under wood) this helps quit a bit as well
The SRG and TBE chambers were not meant to have wood/pellets in them so air flow is your issue. Just ry my ways and if still having an issue PM me
Tommy