I have two MASTER NODES on two different windows wallet and both hangs time to time. I have reported this to DEV. Hoping they will fix this in next wallet release.
I run MNs on Ubuntu 14.04 VPS and it's performance is stable. Win wallet however, hangs every time. In many cases finally it responds after several minutes, but it's not normal. I run several other wallets daily, so I know what is "normal" behavior. I am sure blockchain files are not corrupted - I have deleted, re-sync from zero and from downloaded chain files several times.
Issue is the same on different computers.