My NC Fairlane rear suspension functions ok with out much weight in it. As soon as I get 3 people in the back or a boot full of luggage the warning light comes on after about 1/2 an hour the alarm starts beeping an the back drops and bounces up and down over bumps like its a sponge.

After I stop switch off and restart its ok... till the whole process repeats about 1/2 hour later all over again. Other than this the suspension seems to function well.

I like the air suspension and would like to keep the car factory but this is annoying me.

Could I ask does anyone know where I should begin to look.

Do a diagnostic self test this should show up any faults

The SLS (self levelling Suspension) Is a common failure in teh fairlanes, it could be the lines, the shocks or the pump. Your best bet is to replace with standard suspension. Ie put some new springs and shockers in