I've seen this on 2 of the latest Chromecast w/GTV devices: after using
it for about 3 months or so, the storage is totally full and the apps
stop updating. I then do a factory reset to get things back to normal
(with a couple Gig of free space), and...
This is a bug that needs to be fixed, not help that I need. I used a
Chromecast with GTV for about 3 months as nothing other than a YouTube
streamer and the disk overflowed. This is a BUG REPORT. Send the report
to someone to fix it.