Maybe because of the node. Try to add new nodes:
#0 make sure you actually want bitcoin core [1]
#1 use the torrent [2]
#2 sync with good nodes for the rest, add them with addnode IP add from your bitcoin.conf file [3] or select a single node a use connect=IP
my personal list of nodes:
last updated 2014.10.10
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IP - location - owner[1]- speed - info/stats page[2] - testnet
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84.200.34.113 - Freinsheim, DE, EU - Newar - 1000 mbit/s - yes - no
185.45.192.129 - Amsterdam, NL, EU - anon - 1000 mbit/s - /node.php[3] - yes
213.165.91.169 - Germany, EU - shorena - 100 mbit/s - yes - no
50.7.68.180 - New York, USA - Newar - 100 mbit/s - yes - no
5.9.24.81 - Germany, EU - zvs - unknown - no - no
178.79.173.71 - United Kingdom, EU - zvs - unknown - no - no
107.155.104.194 - Dalls, USA - zvs - unknown - no - no
106.185.32.195 - Japan, Asia - zvs - unknown - no - no
94.242.57.173 - Russia, Asia - zvs - unknown - no - no
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[1] refers to a bitcointalk.org username or anon if requested
[2] same IP, port 80 or path/port given
[3] work in progress
[1]
https://bitcoin.org/en/choose-your-wallet[2]
https://bitcointalk.org/index.php?topic=145386.0[3]
https://en.bitcoin.it/wiki/Running_Bitcoin#Sample_Bitcoin.conf you will have to create the file.