I know a few people who have Zscaler deployed at work. It will routinely kick them of the internet, like multiple times a day. It has gotten to the point where they can sort of tell in advance that it's about to happen.

The theory so far it that it's related to their activities, working in DevOps they will sometimes generate "suspicious" traffic patterns which will then trigger someone policy in Zscaler, but they're not actually sure.