My Stihl edger just recently developed a problem after 4 or 5 years. It will start up and run for a short time with no problem, but when running for at least 10 minutes and then shut off, it will not start again until cooled off. Also yesterday I had several houses in a row and after the edger got hot, it just quit running. Was wondering if this would be a carb problem or ignition? Could it be the coil? I bought a used Stihl fc110 on ebay last night. Can't wait to get it. thanks for any suggestions.