Maybe a new second master override code can be provided to the flight attendants during an incident (via air-phone with ground control) that completely override the pilots lock would cover this issue. There would have to be a risk-assessment on the ground in order to provide this code. Although I'm not sure if there is enough time to do this (8 minutes?).
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Then you have something wrong with your 2012 Nexus 7. Mine (WiFi model) takes I'd guess less than 4 hours to change, and can last days and days. More than a week sitting idle.
Make sure you're using the included high capacity charger, otherwise it will take a day to change.
Criminal charges pending in 3
Unions are a viral problem. Way too much control over politics.
Remove "union" backing from this and I'll start listening, until then, their on my "ignore list".