Getting some error messages from the daemon that I didn't seen before.
2017-Dec-09 10:53:04.658252 [P2P2]Block with id: <9135f7c24d67fc7ad618e231ce2d38f59307b50ae2b23e3aa8640f02aebf0f45>
can't be accepted for alternative chain, block height: 406
blockchain height: 899584
2017-Dec-09 10:53:04.670751 [P2P2][66.205.145.68:57679 INC]Block verification failed, dropping connection
2017-Dec-09 10:53:11.002124 [P2P2]Block with id: <9135f7c24d67fc7ad618e231ce2d38f59307b50ae2b23e3aa8640f02aebf0f45>
can't be accepted for alternative chain, block height: 406
blockchain height: 899584
2017-Dec-09 10:53:11.017717 [P2P2][179.222.127.50:57683 INC]Block verification failed, dropping connection
2017-Dec-09 10:55:12.192352 [P2P1][sock 816] Some problems at write: An existing connection was forcibly closed by the remote host:10054
Restart it a couple of times but no luck. Shall I do a full blockchain sync?
No, this is your daemon correctly rejecting a wrong chain. You don't need to restart the sync.