2003 SUBARU WRX Electrical System Problems

IN MY 2003 SUBARU IMPREZA WRX, ON MULTIPLE OCCASIONS, WHEN I HIT A SMALL BUMP IN THE ROAD (COULD BE AN EXPANSION JOINT IN A BRIDGE OR A CRACK IN THE ROAD SURFACE THAT HAS BEEN PATCHED) WHILE BRAKING, THE ABS KICKS IN AND DOES NOT ALLOW ME TO BRAKE. AFTER ABOUT ONE SECOND HAS PASSED, THE ABS TURNS OFF AND I GRIND TO A HALT. I HAVE LARGER-THAN-STOCK, HIGH PERFORMANCE TIRES, AND ON DRY PAVEMENT, THE STOCK BRAKES ARE NOT CAPABLE OF APPLYING ENOUGH PRESSURE TO LOCK UP THE BRAKES. BUT IF I HIT A SMALL HICCUP IN THE ROAD, THE ABS TURNS ON AND DOES NOT ALLOW ME TO APPLY ANY SIGNIFICANT AMOUNT OF BRAKING POWER. AS SOON AS IT DISENGAGES, THE INCREASE IN BRAKING POWER IS QUITE SIGNIFICANT. I HAVE YET TO BE IN AN ACCIDENT AS A RESULT OF THIS DEFECT, BUT I HAVE LEARNED TO...