You did not answer whether the candle is dry or wet after the engine is "going out". In my opinion, a carburetor for inspection (removal of impurities) and regulation. Also check the purity of the dragon filter in the fuel tank.
I have exactly the same problem with an identical saw, after adding gas it immediately weakens to zero. The saw is not contaminated because it did not work excessively and occasionally and was cleaned. I did not clean once and then there were oily trash which I removed a few days later. I would bet that something will happen with the clutch, but I don't know how to go about it. I am looking for solutions ready on the forum in people who had the same problem.