The poor old processor got overloaded by data came from various sources? I think I posted somewhere that the new routine(s) associated with the MCAS data could overwhelm the control system from time to time, especially during the failure mode [i.e. vane's malfunction].
New flaw discovered on Boeing 737 Max, sources say
...A new flaw has been discovered in the computer system for the Boeing 737 Max that could push the plane downward, according to two sources familiar with the testing, an issue that is expected to further delay the aircraft's return to service.
A series of simulator flights to test new software developed by Boeing revealed the flaw, according to one of the sources...
...In simulator tests, government pilots discovered that a microprocessor failure could push the nose of the plane toward the ground. It is not known whether the microprocessor played a role in either crash.
When testing the potential failure of the microprocessor in the simulators, "it was difficult for the test pilots to recover in a matter of seconds," one of the sources said. "And if you can't recover in a matter of seconds, that's an unreasonable risk.".
Boeing engineers are now trying to address the issue, which has led to another delay in recertifying the 737 Max...
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https://edition.cnn.com/2019/06/26/p...law/index.html