Seems that there are a lot of orphan blocks. Generating load on the CPU...
Here's my daemon version.
"version" : "v3.6.0.0-UT-ZAH-HA-DEZ-BIN",
"protocolversion" : 61400,
"walletversion" : 60000,
2016-08-02 18:31:41 ProcessBlock: ORPHAN BLOCK 6148, prev=8f9b3f86c7191f4d6cb01531c661b499f404c95aded1188796c7d8ae7f9fe831
2016-08-02 18:31:47 ProcessBlock: ORPHAN BLOCK 6149, prev=5f671dd3048f17192b2f0303ed167326429cd98ac1d3f80714d6bd6359739be5
2016-08-02 18:31:55 ERROR: CheckProofOfStake() : INFO: read txPrev failed
2016-08-02 18:31:55 ERROR: AcceptBlock() : check proof-of-stake failed for block 5098b23c92fc9eec6a8fa4a1036aadc8d5d22f9ac3251576f26365213f88c40b
2016-08-02 18:31:55 ERROR: ProcessBlock() : AcceptBlock FAILED
2016-08-02 18:31:55 ERROR: CheckProofOfStake() : INFO: read txPrev failed
2016-08-02 18:31:55 ERROR: AcceptBlock() : check proof-of-stake failed for block 5098b23c92fc9eec6a8fa4a1036aadc8d5d22f9ac3251576f26365213f88c40b
2016-08-02 18:31:55 ERROR: ProcessBlock() : AcceptBlock FAILED
2016-08-02 18:31:55 ERROR: CheckProofOfStake() : INFO: read txPrev failed
2016-08-02 18:31:55 ERROR: AcceptBlock() : check proof-of-stake failed for block 5098b23c92fc9eec6a8fa4a1036aadc8d5d22f9ac3251576f26365213f88c40b
2016-08-02 18:31:55 ERROR: ProcessBlock() : AcceptBlock FAILED
2016-08-02 18:31:55 ERROR: CheckProofOfStake() : INFO: read txPrev failed
2016-08-02 18:31:55 ERROR: AcceptBlock() : check proof-of-stake failed for block 5098b23c92fc9eec6a8fa4a1036aadc8d5d22f9ac3251576f26365213f88c40b
2016-08-02 18:31:55 ERROR: ProcessBlock() : AcceptBlock FAILED
2016-08-02 18:31:55 ERROR: CheckProofOfStake() : INFO: read txPrev failed
2016-08-02 18:31:55 ERROR: AcceptBlock() : check proof-of-stake failed for block 5098b23c92fc9eec6a8fa4a1036aadc8d5d22f9ac3251576f26365213f88c40b
2016-08-02 18:31:55 ERROR: ProcessBlock() : AcceptBlock FAILED
2016-08-02 18:31:57 ProcessBlock: ORPHAN BLOCK 6150, prev=47ad059bb122b0b9131e7bbebb30ca5daa64296a110ef4b66570eb6040bac924
2016-08-02 18:32:02 connect() to 191.134.83.91:44440 failed after select(): Connection refused
2016-08-02 18:32:02 keypool reserve 46
2016-08-02 18:32:02 keypool return 46
2016-08-02 18:32:10 ProcessBlock: ORPHAN BLOCK 6151, prev=970ce4fb315fb2a53650f940e3825fe272640200762f2568544efece396ab7b2
2016-08-02 18:32:12 ProcessBlock: ORPHAN BLOCK 6152, prev=2eff24e3984afbfa4098d9c3946b94cc0e3a7d04d39f4f5ad42553b562b20c98
2016-08-02 18:32:12 ProcessBlock: ORPHAN BLOCK 6153, prev=1154c004230465123d3cd33882452b9d1fa12be31e957e2aff28e95d2746c09c
2016-08-02 18:32:12 ProcessBlock: ORPHAN BLOCK 6154, prev=e26a295d2ece6c51fb4f51f29aa0291cfbaf54015550982a68486cb010a606a0
2016-08-02 18:32:12 ProcessBlock: ORPHAN BLOCK 6155, prev=d54dc78e10576b1184984d47f68bc1e86ce4f1300e3c4bacc59bac3ed5fa8485
2016-08-02 18:32:16 ProcessBlock: ORPHAN BLOCK 6156, prev=e4821d1c167e59b84ec10981e9694c22aab9d07d1b20448ad781f2b381f29b1b