Suddenly stops recognising any logon credentials

[simpleSimon]

My Pogoplug works fine for a few days, and then suddenly stops recognizing any login credentials, forcing me to do a fresh install.

I am using it as a motion sensing security webcam, that is constantly writing snapshot pictures and or motion capture videos. The problem occurs after a random number of days that ranges from 1 to 20 days. At most, 5GB of disc space is consumed by motion capture records. All software continues running beyond the point when the logon credentials fail.

Device details : Pogoplug v2 Pink with USB memory stick or hard drive, plus USB Logitech C120 webcam
(I have tried many different USB memory sticks and a 500GB USB hard drive, all with the same results.)

Installation steps :
- Arch linux,
- packages :motion, lighttpd, php-cgi, openntpd, ffmpeg,
- set timezone to Europe/London
- configure motion and lighttpd

Running software: motion, lighttpd & intermittent calls to ffmpeg

Please advise if there is any way to avoid this issue, or how to recover from it when it occurs again.

[grayman4hire]

What logon credentials are your referring to?

[simpleSimon]

root user/password. I also set up another user (webcam) but it doesn't recognise this either. Could the file system have been corrupted somehow?