I've also experienced this issue with the TrafficEstimatorService and would recommend taking a look into that as well...
Date Operations Description RequestId ResponseTime
2013-05-15 16:24:36.263 2000 TrafficEstimatorService - 2000 keywords 0004dcc861bed9700ada1e0a064cfe69 73
2013-05-15 16:24:35.680 1 TrafficEstimatorService - 2000 keywords 0004dcc861a051080ada1cd7192ec647 717
2013-05-15 16:24:33.687 2000 TrafficEstimatorService - 2000 keywords 0004dcc8619715c00ada528528734d08 76
2013-05-15 16:24:33.123 1 TrafficEstimatorService - 2000 keywords 0004dcc8617cb3d80ada1cd7192ec647 469