Re: My android device died while playing pvz2 and I lost all my progress again.
From the information provided it appears you have experienced this game save progress lost before so I am assuming when your tablet shuts down unexpectedly (due to no power?), there might have been data corruption occurs to your game save file.
If this 'data corruption' is only local to your device, then there are a number of ways to have your progress restored. Before I go further, may I ask a few questions please?
1. Have you register your email for a gems reward before?
2. Do you know or have you screenshot your original player ID (with the progress of up to Dark Age Night level 19)?
3. Have you got the game installed on another device?
If the answers are yes to all three, I would suggest try deleting the game and do a re-installation followed by an email register with your original email to recover your old account.