sophos xg have issus in the first time configuration

Hello all,

I have issues in Sophos xg as following:

I installed Sophos xg “SFOS 17.1.0 GA” in pc core i3, Ram 4G, 80G HDD, connect it with AD

I made a policy that allow all traffic from any to any for any user, I want to test the firewall in the first time, but I notes these:

I have 2 issues: when I choose " Match known users " in the roll and select a group of users in AD the internet stopped in their PCs, so the internet just works when un-choose " Match known users ". But even the internet works the big problem that: there are continuous cutting in the Internet, I connect the users now directly to the modem, I want to solve this problem before I can return Sophos to service.

Thanks

Sami