Where we live it is quite hilly so 3 Blue Gears replaced with Brass. One Clutch replaced under warranty, now runs intermittently. May be a faulty torque Sensor, controller or loose connection? Maybe these were all made on a Monday morning. I dunno. They haven't been reliable as far as I am concerned & I don't think it is reasonable to expect all 3 riders to be abusing them. I didn't think the conditions were so extreme to require overbuilt units so I am at a loss as to what is going on. I need someone in Washington, State that would be willing to have a look at a customers motor to see if they can diagnose the current quirky sensor problem. May be something simple or may just need to be replaced. I know someone on the board is from Puyallap, Wa. if you receive this message and willing to help, please message me. Thanks.