I had similar problems with disconnecting the flash drive and at the same time i see sector errors in the syslog. I formatted in a different file system, but eventually helped exchange flasdisk for another
Same here, in last five days three times unexpected unmount.
After ‘fsck’ and ‘mount’ all fine. I just lost some logs and statistics.
It started last week, occured three times already.
(flash drive is used for 1,5 year only in my Omnia)