There appears to be a pretty terrible memory leak after we updated to MC 1.1. Until we get this fixed, you will notice: Every hour or two, the server will solidly freeze for up to five minutes as Java tries to reclaim memory. You and everyone will be kicked, but there will be no data loss. The server will be unresponsive during this time. After 24 hours or so, the server will crash entirely. We're hoping to avoid this with periodical server restarts until we get the problem fixed. This mostly impacts the survival server.