Q) My mobile unexpectedly reset and now it's asking me to log in again.
A) This is a new and relatively rare bug. It seems that if your phone
runs out of power, especially during a sync, the OggSync database may
be corrupted and this happens. To recover, the easiest thing to do is
to clear your calendar and contact database (easiest method right now
is a hard reset).
If you have a lot of user data, then you can back up your calendars by
visiting this link: https://www.google.com/calendar/exporticalzip
Then set up OggSync as normal. OggSync should match most of the events in both.
If there are problems with restoring the sync state, you can clear and
restore from the backup on Google and then sync again with OggSync
which will clean up your phone. (The phone should have also made a
backup prior to syncing if you didn't do it yourself.)