Probably crank seal leak
Well I cleaned it out as best as I could. I used carb cleaner to clean out all the little orifaces and it ran just fine initially. Yes you have to love ethanol.You said you replaced the diaphragm but did you clean the carb while you were at it? My saw would do the same thing so I put a kit into the carb, cleaned it and that fixed it. I did find out later if I put the saw away with gas still in the tank it would act up again so I now drain my two strokes and run them until they die. No problems since. You can thank ethanol for that.