I just wake up and I find my client with delegates with 0 connections, this is the console log that I found:
Peer 146.185.186.245:56182 disconnected us: You offered us a block that we reject as invalid
--- there are now 31 active connections to the p2p network
--- there are now 32 active connections to the p2p network
--- there are now 31 active connections to the p2p network
--- there are now 32 active connections to the p2p network
--- there are now 31 active connections to the p2p network
--- there are now 32 active connections to the p2p network
--- there are now 31 active connections to the p2p network
--- there are now 30 active connections to the p2p network
--- there are now 31 active connections to the p2p network
--- there are now 32 active connections to the p2p network
--- there are now 31 active connections to the p2p network
--- there are now 32 active connections to the p2p network
--- there are now 31 active connections to the p2p network
--- there are now 32 active connections to the p2p network
--- there are now 33 active connections to the p2p network
--- there are now 0 active connections to the p2p network
I restarted the client and now I have 12 connections
EDIT: 
emski suggest me to check my p2p.log and I found similar log error (the ip address is the same):
20140707T030112.485619       th_a          accept_loop ] accepted inbound connection from 61.177.35.218:64623                   node.cpp:2446
20140707T030112.487557       th_a    accept_connection ] established inbound connection from 61.177.35.218:64623, sending hello                 peer_connection.cpp:53
20140707T030113.765456       th_a terminate_inactive_c ] Forcibly disconnecting from handshaking peer  due to inactivity of at least 5 seconds                  node.cpp:835
20140707T030113.765514       th_a terminate_inactive_c ] Peer's negotiating status: closing, bytes sent: 0, bytes received: 0                   node.cpp:839
20140707T030113.765551       th_a terminate_inactive_c ] Forcibly disconnecting from handshaking peer  due to inactivity of at least 5 seconds                  node.cpp:835
20140707T030113.765574       th_a terminate_inactive_c ] Peer's negotiating status: closing, bytes sent: 0, bytes received: 0                   node.cpp:839
20140707T030113.765605       th_a terminate_inactive_c ] Forcibly disconnecting from handshaking peer  due to inactivity of at least 5 seconds                  node.cpp:835
20140707T030113.765627       th_a terminate_inactive_c ] Peer's negotiating status: closing, bytes sent: 0, bytes received: 0                   node.cpp:839
20140707T030113.765656       th_a terminate_inactive_c ] Forcibly disconnecting from handshaking peer  due to inactivity of at least 5 seconds                  node.cpp:835
20140707T030113.765677       th_a terminate_inactive_c ] Peer's negotiating status: closing, bytes sent: 0, bytes received: 0                   node.cpp:839
20140707T030113.765707       th_a terminate_inactive_c ] Forcibly disconnecting from handshaking peer  due to inactivity of at least 5 seconds                  node.cpp:835
20140707T030113.765728       th_a terminate_inactive_c ] Peer's negotiating status: closing, bytes sent: 0, bytes received: 0                   node.cpp:839
20140707T030113.765769       th_a terminate_inactive_c ] Sending a keepalive message to peer 89.231.94.1:56559 who hasn't sent us any messages in the last 18 seconds                   node.cpp:905
20140707T030113.765795       th_a terminate_inactive_c ] Sending a keepalive message to peer 188.138.107.159:47755 who hasn't sent us any messages in the last 18 seconds                       node.cpp:905
20140707T030114.687815       th_a            read_loop ] disconnected 11 eof_exception: End Of File
End of file 
    {"message":"End of file"}
    asio  asio.cpp:22 read_write_handler
    {"len":16}
    th_a  stcp_socket.cpp:73 readsome                   message_oriented_connection.cpp:144