My 95 M3 with a little over 100k started to develop issues with knock sensors. At just under 3k rpm in 1st or 2nd gear, the knock sensors will intervene momentarily. Past 3k rpm, power resume. it begin about 1k miles ago. Reading the codes indicate knock sensors issues. My mechanic has another customer who has the same issues. the knock sensors been replaced twice and it had not resolve the customer's car problem. Anyone else has this problem?