I have the same problem. I washed my engine, covering battery and alternator with plastic bags... Right after it drove just fine... but day later I have the same symptoms, ABS lights on for a second and during that time the speedometer drops to 0 and then goes back to normal... although like mentioned above no performance issues... and my battery was drained overnight... I read other posts and it leads me to believe the alternator somehow went bad... Did you find solution to the problem?