Higher than usual rejects today should be fixed now. I made some changes earlier today which unfortunately introduced a bug. It's fixed now.

Also I fixed some other issues which were causing some miners to disconnect if they didn't get jobs often enough. Current jobs are rebroadcasted now quit often so that your miners won't think that the connection to the pool is stale. Previously some miners wasted time to disconnect and reconnect if they didn't hear from the pool. It wasn't affecting lot of miners, but if your miners were doing this, your hashrate should increase.