Hey,

Thanks for the quick answer, in the last occurrence I try to run the update statistics command on the exclusive table, but the problem was not solved, OK, maybe I waited very little time, because, 2 minutes later I already run the rebuild index on the PK of the table.

We have a great control about the querys running, and in the moment that the CPU is high, is always the same querys, I run a profiler, and a take the same querys that are running normally.

Actually, my ideia of comment here, is to see if anyone already had this crazy problem, my servers have 3 years of use, and along of this time we have made a lot of changes on hardware, cpu, hard drivers, network, a lot o SQL and Windows updates.

I will try to capture in the next event the times and querys that are running slowly and compare the time of the same querys running when the systems is OK.