can not sync, stuck.... help...

SYNCHRONIZATION started
2018-07-15 13:20:25.986 [P2P8]  ERROR   blockchain      src/cryptonote_core/bloc
kchain.cpp:3134 !!!!!!!!! difficulty overhead !!!!!!!!!
2018-07-15 13:20:29.956 [P2P8]  ERROR   blockchain      src/cryptonote_core/bloc
kchain.cpp:3134 !!!!!!!!! difficulty overhead !!!!!!!!!
2018-07-15 13:20:33.143 [P2P6]  INFO    global  src/cryptonote_protocol/cryptono
te_protocol_handler.inl:304     [173.208.248.106:33344 INC] Sync data returned a
 new top block candidate: 12501 -> 14636 [Your node is 2135 blocks (1 days) behi
nd]
SYNCHRONIZATION started
2018-07-15 13:20:36.921 [P2P3]  ERROR   blockchain      src/cryptonote_core/bloc
kchain.cpp:3134 !!!!!!!!! difficulty overhead !!!!!!!!!
2018-07-15 13:20:52.005 [P2P8]  INFO    global  src/cryptonote_protocol/cryptono
te_protocol_handler.inl:304     [31.16.187.21:26977 OUT] Sync data returned a ne
w top block candidate: 12501 -> 14636 [Your node is 2135 blocks (1 days) behind]