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?).
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".