is it only me or does the zeitcoin qt client sometimes gets stuck at blocks and requires a restart to move on?
It used to do that for me but not since the update. Did you check your connections when that happens?
Are you probably behind a firewall without UPNP?
If so or if you run into connection issues you can try to set fastconnect=1 that should help you get rid of stale connections to clients that have been shutdown or disappeared for some reason.