Hi Brian
We did not receive any tips for troubleshooting. It appears that support assumed that the signature was the problem, and my colleague changed the update policy. At this point, it is not clear that rolling back the IPS definition helped. Some colleagues said the problem disappeared after a reboot, some said they had to keep rebooting yet the problem persists. I am reaching out to impacted users to see if they can install 12.1.5. As I gather more information, I will provide updates.
The common complaint we hear is that "the Internet is slow." But our network guys confirmed that our network is fine. When we restart the SEP services or reboot, surfing is fine again. So all roads seem to lead to SEP.
Bob