no sweat, i had a brainfart, didnt comprehend what you were saying.
very very rare but it can happen where a spider nest causes irratic operation, usually they create conplete blockage.
id still look for whats causing the disruption in the fire tetrahedron. we know there is fuel, oxygen and heat.
the fourth part of the fire tetrahedron specificaly is reaction. in this context it involves the correct mixing of the first three.
the OP needs to look for whats keeping that from happening