Odd performance behaviour on QVS

[#1]

As a part of a trying to identify the root cause of a performance issue on a 8.5 x64 QVS, I came across this odd behaviour on the server performance window. It seems to happen a few times a day with 2-10 users on the system and slows down the performance for all users (making it feel like the system is hung up). Typically, we see this lasting for between 2-5 minutes. Ocassionally, we have to restart the service for the system to get back to normal. Other times, the system gets back to regular performance in a few minutes.

Has anyone else come across something like this? Any ideas/suggestions for troubleshooting?

[#2]

Just wanted to share with everyone that mshta.exe was the problem behind this issue. We stopped using QlikView Management console on the server for the last week and the problem has not surfaced again.

Thank you all for your help.