Why is synchronization now faster than before? One week passed in half hour

Small change to syncing in version 1.5.5.1, wouldn't think it would have that much effect. Usually the newest days are slower as there has to be more in depth test. The older back in the chain the faster the syncing is.
1.5.5.1 version
4 days synced very quickly, then it has refused to sync any further, restarts make no difference
This is what is in the debug log for hours without syncing anymore.
2017-08-09 02:41:30 Misbehaving: 173.244.48.198:53131 (3000 -> 3100) BAN THRESHOLD EXCEEDED
2017-08-09 02:41:30 ERROR: ProcessBlock() : block with too little proof-of-work
2017-08-09 02:41:30 Misbehaving: 173.244.48.198:53131 (3100 -> 3200) BAN THRESHOLD EXCEEDED
2017-08-09 02:41:30 ERROR: ProcessBlock() : block with too little proof-of-work
2017-08-09 02:41:30 Misbehaving: 173.244.48.198:53131 (3200 -> 3300) BAN THRESHOLD EXCEEDED
2017-08-09 02:41:30 ERROR: ProcessBlock() : block with too little proof-of-work
2017-08-09 02:41:30 Misbehaving: 173.244.48.198:53131 (3300 -> 3400) BAN THRESHOLD EXCEEDED
2017-08-09 02:41:30 ERROR: ProcessBlock() : block with too little proof-of-work
2017-08-09 02:41:30 Misbehaving: 173.244.48.198:53131 (3400 -> 3500) BAN THRESHOLD EXCEEDED
2017-08-09 02:41:30 ERROR: ProcessBlock() : block with too little proof-of-work
2017-08-09 02:41:30 ProcessBlock: ORPHAN BLOCK, prev=35cbc2069ff9a30d6cb4
2017-08-09 02:41:49 connection from 98.71.70.41:57555 dropped (banned)
2017-08-09 02:42:33 ping timeout: 1200.030000s
2017-08-09 02:42:38 connection from 92.30.32.29:63078 dropped (banned)
2017-08-09 02:42:52 connection from 104.207.128.75:63738 dropped (banned)
2017-08-09 02:44:52 connection from 104.230.143.200:33369 dropped (banned)
╥Aztek
Hmmm. Would you mind to stop the client. Start it back up with the -debug flag passed to it. And then zip up the debug.log file and send it to me. Not sure why this happened I will play around a bit with syncing with 1.5.5.1 to see if I can re-create.