Just had M45 installed on my 2006 M5. Rear sensors are only 8.5 inches apart. When I start car the buzzer alarm starts and does not stop. It is very loud and have to switch the unit off. Sometimes I can turn on at it works fine. Saw that the units were supposed to be 50-60 cm apart. My installer put the rear sensors about 21 cm apart. Do you think this could be causing the problem?