I have a 2006 650i cabriolet. The TPM often indicates the right front tire is low on air. Sometimes the left front about five percent of the time, but never the rear tires. Pressure is never low. After about three resets the problem goes away. I change winter wheels/tires seasonally, but still the TPM indicates the right front tire is low, so it does not appear to be the sensor in the wheel. This happens more frequently when nights are cold and days are relatively warm. Any ideas?