Same here. Car was running just fine after having some work done a little over a month ago. Next thing I know I am driving home doing a reasonable 50-55mph and my dash lights up. At first it took longer for the lights to come back after a reset (turn engine off/on), but now it is much more frequent. After reading other posts about speed sensors and changing brakes I wonder.... I had a 17" spare on my drivers front side that seemed to fit pretty tight and not much breathing room for the rotors and brakes (I have a 19" staggered setup with 235/35/19s on the front). I just replaced the fronts yesterday hoping it would solve the problem, but lights still came on.
"sim simma, who gat di keys to mi bimma" - beenie man