Hey there all. I have a Hitec 5585MH servo in a Duratrax dxr8e ebuggy. It is powered by a castle monster 2 (currently returned to the factory for warranty repair) and controlled by an Airtronics MX-sport. The servo at times, make a whining noise with no load. This is my first Digital servo. I have been using hitec mg645 for years. Any ideas?