When hitting a very specific speed range; 47-53kmh-ish (right on the bloody city speed limit!), i can feel the car slowing down as if the brakes are coming on and a faint droning/rumbling noise coming from the back end. The revs also drop when this happens.
My guess was the ABS was doing something funny or even the stability control etc. I had the car inspected by a volvo specialist before i bought the car and nothing came up of that nature.
Anyone else experienced it? im terrified it's the dreaded DEM shitting out....
Cheers!