FRiC

This issue is fixed in the Internet protection module version 1382, which is currently in testing.
You will be able to remove https://esmc from the whitelist when it's released for your product version(s).

I think this behavior has been already reported and probably fixed in the meantime. Maybe @Marcos will know more details of whether module responsible for scanning network has been updated in the meantime. It is also possible that update was canceled which might explain why only specific devices were affected.