GAO F-35 JOINT STRIKE FIGHTER: Action Needed to Improve Reliability.... gives a shocking statement about life support systems...

via GAO Report

Life support system: The program has identified over 35 pilot physiological events, of which nearly 30 occurred in-flight. An action team made of government officials, contractors, and doctors completed their work by May 2018. A root cause investigation did not identify any F-35 system deficiencies, but reported it was difficult to fully determine the problem due to a lack of real-time data. Contracting officials stated that this is partially because the technology has not yet been developed to monitor pilot’s health in flight, in real time. The prime contractor continues to try to develop a means to monitor pilot health.

Report here. 

Kinda let's you know why the Japanese paper speculates that the pilot of their lost F-35 suffered some type of in-flight debilitating incident don't it.

Has this been known cause it's new to me.

I know we're suppose to listen to the pilots so why aren't they telling us about this.