Is the pool having troubles? deepbit.net again shows a steep drop in miner performance despite my miners running at full speed.

Never mind, reported performance is back to normal, although variance appears to remain slightly higher.

About two hours ago the performance of my miners as reported by deepbit.net dropped significantly (by about 25%), yet my miners are still running at full speed and are still reporting the original performance in their log files. Also, deepbit.net tells me that all miners are still online.

Does the server have an hickup or what does cause this imbalance?