My 395 became a 1 speed machine yesterday-the highest speed only. The switch would work on high no matterwhat part of the range it was in., which is a good default choice when it fails.
I had already put a new switch in a shopping basket, but today figured that I’d try cleaning the old one as a previous commentor had suggested, before ordering the new one.
After careful brushing and flushing (with alcohol) the tool NOW functions at more than one speed, but the highest speed it will now reach is about half speed. I should have left well-enough alone-until the new switch arrives.