Koby F

Is the gas orifice the bronze hole on the square bar connected to the gas line?

So I have a NC Tool Whisper baby forge and up until today it worked fine. I used it yesterday with no problems. Today I tried to light it up and it took a sec but lit and stayed working for about 2 hours. In the last 20-30 min, it seemed like the gas would cut off/flame would go out for a split second and then re-light. Then it just went out. I check the valves and the whole burner itself and saw no blockages. I was told it was either the tank or the regulator so I got a new tank to test and it still won't work. It seems to light now for about 10 sec and then the flame like blows back and there is a quick flash of fire out the back side of the burner and then the fire dies. Anyone have suggestions? In the morning I'm going to get a new regulator order but I wanted to see if there were any other easier/quicker possible fixes? I should also mention that the regulator seems fine, the gauge stays consistent and I can adjust the psi, I've tried from like 5 to 15 to see and nothing works.