Try running -resync and adding the nodes listed below. Also try doing what CasualSam mentioned: sync using cryptonited and then once fully synced switch to cryptonite-qt. It'll probably sync more smoothly and faster that way.

92.234.72.146:8253
58.58.56.226:8253
47.55.147.150:8253
77.58.253.73:8253
119.81.51.10:8253