It halted again. The spot config says:

2018-Feb-02 14:54:16.952690 WARNING Block c4ee84473c3ad9be27b852f253a14de6f45b15
9e3c0da46fdcd9606a9a9db681 added to alternative chain. Index: 6773
2018-Feb-02 15:12:41.450230 WARNING [95.67.102.200:19497 OUT] Exception in connectionHandler: TcpConnection::read, WSAGetOverlappedResult failed, result=10054, An existing connection was forcibly closed by the remote host.

I have no idea what is happening.