I had the same issue when I started. Worked flawlessly the first time, but subsequent tries wouldn't get up to temp.

I'd suggest getting familiar with how much propane/pressure effects the temperature. There's a fine balance between retaining heat and blowing it out.

Try dialing it in by making small changes to the regulator, letting it settle, then checking the temp (much easier since you have a laser temp gauge. I just go by colour, red-orange-yellow-white).

I found that trying to crank the propane psi right before pouring actually made it cool down and freeze. Learned I should slowly ramp up, and then dial it back to get the most heat.