iSPI Availability Pct(avg) report data issue

Hi,

 

We have installed NNMi 9.0 with patch-4 and iSPI 9.0 in our environment.

 

We are finding issues in iSPI availability report data. We have few routers which are 24/7 up but in the report it shows only 60-75% available. On selecting business hours (10-6pm) it shows more than 90% available.

 

Please help me understand how this report is calculated and help resolving if there is any issue at the earliest.

 

Regards,
Dharmesh Shah.