Hypoxia is another consideration that's worth looking at and would certainly explain the wild altitude changes. It's a shame that it's not being explored as clo

Hypoxia is another consideration that's worth looking at and would certainly explain the wild altitude changes. It's a shame that it's not being explored as closely as some of the other theories. Particularly when you consider it was responsible (at least partially) for the downing of Helios flight 522 in 2005.