Hi,
From what I read on various forums, it appears that they can't fix this problem which has been around for quite a while. The only workaround seems to be not using some of the monitoring shields, which means you are not fully protected. So the "fix" option is not viable.
I read about what was improved in the latest version and it didn't mention this problem.
Anyway, thank you for your suggestions. I may have to go back to "Spy Sweeper"