There is a YouTube video about the HKC 55 posted by Donavans Homes. You can see in this video a few instances where the FSK250 does not properly reset. My thought was that he might not have the gib cams adjusted correctly.
With this thread, I wonder if the return spring in the FSK250 does not have enough force. A lubricant applied to the guide rail reduces friction between it and the saw baseplate. Now the return spring force is capable of consistently overcoming the friction force.