If you were running ≤1.0.2, you will likely get stuck on block 59372, and will repeatedly see a message like this in your ~/.zcash/debug.log file:
ProcessMessages(headers, 238081 bytes) FAILED peer=6
If that is the case, simply upgrading to 1.0.5 will not be enough, since the problem is that your chainstate database is corrupted. In order to recover, you will need to upgrade to 1.0.5 and then run zcashd -reindex in order to clear out and rebuild your chainstate database.