I'm on day 3 and still, 2 then 3 hours behind. It has been this way for 2 straight days now. My clock is right... Damn! Can you have 2 wallets on the same machine? I'm thinking about just downloading another one.
I'm in the same situation. Blockchain had been synchronized, but it kept falling behind. 56 connections, ports were open. Connection is solid, fiber optic 25/5. I tried reindexing to no avail. I just uninstalled AVG and, coincidence or not it suddenly resynced. So do you have any antivirus programs running?
Running Multibit is a fine fix, but I feel like if I'm already going to have a computer on 24/7 with plenty of space I might as well run another node with the full block chain to keep the network strong.