I am using an LP2985IM5-5.0 with the recommended circuit from the data sheet. I have 10V input, 5V out, about 10mA load. I have seen 2 failures where the output voltage is about 6.5V on both failures. There is no oscillation on the failed unit, the 6.5V output is very clean. On a failed unit I measure about .95V on the bypass pin. What are possible failure modes that can cause this type of failure?