Has anyone had problems with the newer Stihl string trimmers and chain saws. I have had mine in the shop as much as I use them. Every year the trimmers has to have new carbs. I use fresh gas and stihl oil at the recomended mixes. I use sta-bil in the gas also. My latest trimmer is two years old and two new carbs.The repair man says he has changed bunches of carbs in the last year. Stihl uses to stand for quality and reliability.End of rant.