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Today my speedometer started switching from mph to km/hour on it's own. I was going 70 on the freeway, then instantly 115 . Freaked me out till I realized it switched units of measure. It proceeded to switch back & forth seemingly at random. Anyone have an idea what would cause this? When it went to the metric reading, I hit the E/M button on the DIC and it went back to mph. However, it would continue switching back & forth again all by itself shortly thereafter. I tried the reset button too but it didn't stop the speedo from changing from mph to km/hour on it's own. Any ideas why my speedometer is doing this?