[SOLVED] LTE JSS15J stock not fetching mail on schedule
After noticing that other regular synching tasks (like CalDav, CardDav and FolderSync) were also not running, I found out that I had somehow managed to disable synching altogether from the "accounts and synchronisation" setting screen.
What I found a bit odd is that the only way I discovered to get to this screen is from within the CalDAV-Sync or CardDAV-Sync apps. I think this should be available from the device settings as well, but haven't been able to locate it.
I have no recollection of consciously turning this off but can't rule out I accidentally did so without noticing. Anyway, synching is working flawlessly now.