BO4 - CMC/Sessions does not match monitoring applications sessions reported

Hi,

In our monitoring application, from time to time we are seeing the webi processing servers show a danger watch event - sessions between 45 and 50.

In CMC/Sessions however when look only see 3 sessions. 2 users logged in.

The sia stopped/started daily and the 3 is accurate rather than the 49 I believe.

Using BO4 SP6.

All 4 webi processing servers reporting this.

Anyone else seen this?

Thanks