low difficulty attack problem was solved.
Attack mitigated and terminated within 12 hours.
Code fork @ block #377777 to prevent this type of attacks in the future was implemented successfully.
Time synchronization is strictly required to succesful mining now.
Network can tolerate 5 minutes delta only since block #377777.
If you see follow errors at your daemon/log - Timestamp of block with id: <***>, 1518738009, bigger than adjusted time… - sync the time please.