Make sure the fuel filter is clean and when you put in new fuel line it does not pinch. Check the bolts on the cylinder if old and rattled they sometimes come loose and if they get too far it can air gap causing a full throttle stall out. This usually damages the cylinder walls rings and piston(super expensive fix usually a toss unless you have parts saw)
The other thing to check is the high and low port adjustments, I am not familiar with your brand of machine so little I can offer in advice on that. There are some good tuning video on chainsaw on you tube.
If you are good at small engine repairs you can buy used saws and have a few part ones but otherwis stay with new as the time and material for rebuilds adds up fast.
While you have it apart take the clutch and brake apart check for.wear and lube with good quality grease.