¿Hay algo raro en el log? ¿Has probado a pararlo ('bitcoind stop') y darle otra vez?
En el log todo parece raro, lo he parado y arrancado varias veces, incluso lo he dejado un par de días sin hacer nada por si era un ataque o algo así.
Del log lo que me parece más intersante lo copio aquí:
ERROR: ConnectInputs() : 4704788d9b mapTransactions prev not found 4bbe6168c8
ERROR: AcceptToMemoryPool() : ConnectInputs failed 4704788d9b
storing orphan tx 4704788d9b
received: tx (1341 bytes)
ERROR: ConnectInputs() : 70e2fcdb0a mapTransactions prev not found 01be544881
ERROR: AcceptToMemoryPool() : ConnectInputs failed 70e2fcdb0a
storing orphan tx 70e2fcdb0a
received: tx (619 bytes)
ERROR: ConnectInputs() : af45822249 mapTransactions prev not found 31367f45c8
ERROR: AcceptToMemoryPool() : ConnectInputs failed af45822249
storing orphan tx af45822249
received: tx (257 bytes)
ERROR: ConnectInputs() : a72269279d mapTransactions prev not found 571c17ac3d
ERROR: AcceptToMemoryPool() : ConnectInputs failed a72269279d
got inventory: tx af4582224933e60c4185 have
got inventory: tx 0f3b6cd26444bbc13e41 new
askfor tx 0f3b6cd26444bbc13e41 1382373353000114
got inventory: tx 07d4c78bdd209ad06704 new
askfor tx 07d4c78bdd209ad06704 1382373593000115
got inventory: tx eb8c50dba9c2e1cb45b1 new
ERROR: ConnectInputs() : 80313e5542 mapTransactions prev not found 5b9621ca07
ERROR: AcceptToMemoryPool() : ConnectInputs failed 80313e5542
storing orphan tx 80313e5542
received: inv (37 bytes)
got inventory: tx 511569e013c4fc899b34 have
received: tx (295 bytes)
ERROR: ConnectInputs() : e03cb7de6d mapTransactions prev not found 7308009016
ERROR: AcceptToMemoryPool() : ConnectInputs failed e03cb7de6d
storing orphan tx e03cb7de6d
received: tx (258 bytes)
ERROR: ConnectInputs() : 1c0c9eeff5 mapTransactions prev not found b68fc5304f
ERROR: AcceptToMemoryPool() : ConnectInputs failed 1c0c9eeff5
storing orphan tx 1c0c9eeff5
received: inv (37 bytes)
got inventory: tx 80313e55426460072082 have
received: tx (259 bytes)
ERROR: ConnectInputs() : 76cd744a8b mapTransactions prev not found 2c956250a0
ERROR: AcceptToMemoryPool() : ConnectInputs failed 76cd744a8b
storing orphan tx 76cd744a8b
received: tx (225 bytes)
ERROR: ConnectInputs() : cb3a6c54a7 mapTransactions prev not found 29b53bc80b
ERROR: AcceptToMemoryPool() : ConnectInputs failed cb3a6c54a7
storing orphan tx cb3a6c54a7
received: tx (521 bytes)
ERROR: ConnectInputs() : 8dc280aabc mapTransactions prev not found 7c7e3ce942
ERROR: AcceptToMemoryPool() : ConnectInputs failed 8dc280aabc
storing orphan tx 8dc280aabc
received: tx (226 bytes)
ERROR: ConnectInputs() : 1dd76a649f mapTransactions prev not found 0b14c1933d
ERROR: AcceptToMemoryPool() : ConnectInputs failed 1dd76a649f
accepted connection 5.9.245.121:29389
accepted connection 5.9.30.207:16115
accepted connection 46.4.64.21:23667
accepted connection 144.76.70.73:32526
************************
EXCEPTION: 11DbException
Db::put: Cannot allocate memory
bitcoin in ProcessMessage()
ProcessMessage(block, 31591 bytes) FAILED
received: block (36135 bytes)
received block 00000000000000236500
REORGANIZE
socket closed
disconnecting node 180.141.74.183:46544
socket no message in first 60 seconds, 1 0
socket no message in first 60 seconds, 1 0
socket no message in first 60 seconds, 1 0
socket no message in first 60 seconds, 1 0
socket no message in first 60 seconds, 1 0
disconnecting node 88.198.41.74:12616
disconnecting node 5.9.245.121:29389
disconnecting node 5.9.30.207:16115
disconnecting node 46.4.64.21:23667