Mystery problem! My HyperScorpion -- now 2,000 plus miles old and never crashed -- had an intermittent problem where the speed reading would jump around wildly and mess with peddle assist (unless I was in R mode). Juiced support suggested replacing the controller, which I did carefully last weekend. But the wacky speed readings remain AND now there's a loud knock coming from the motor. Is the new controller defective or was the problem something else all along. Juiced has not responded with their diagnosis and I'm totally baffled about how to proceed. Suggestions are most welcome.