[arrrghhh]

+1 to what nate said, and I think I can speak to #3 specifically. This is most likely due to your SD card in general, have you tried a different card? Sometimes I wonder if this project is just slowly basting our cards until they eventually die a glazed and delicious death.

Sorry, I'm hungry.

Also in respect to #2 - seems to be related to this nasty system_server process absolutely hogging every processor cycle it can absorb. Devs are looking into the cause, but the reason seems relatively unknown at the moment.