Sentinel logs:
2019-05-16T02:15:15.581Z tendermint E[2019-05-16|02:15:15.580] Connection failed @ recvRoutine (reading byte) module=p2p peer=a2168aac2fd241a4780a38e104d1eb9d29275555@0.0.0.0:46691 conn=MConn{34.240.43.87:46691} err=EOF
E[2019-05-16|02:15:15.581] Stopping peer for error module=p2p peer="Peer{MConn{34.240.43.87:46691} a2168aac2fd241a4780a38e104d1eb9d29275555 out}" err=EOF
2019-05-16T02:15:43.496Z tendermint E[2019-05-16|02:15:43.496] Dialing failed module=pex addr=a2168aac2fd241a4780a38e104d1eb9d29275555@34.240.43.87:46691 err="dial tcp 34.240.43.87:46691: i/o timeout" attempts=0
Validator logs when stopped (no error):