Symantec endpoint protection doesn't work on Wifi

On LAN Network SEP works fine, but when I switch to wireless, SEP service in client stop works after 3 minutes.

Do you now what is the cause? In logs on windows or Symantec I didn't see nothing, and reinstall and remove didn't help.

Operating System is Windows 8.1 and Windows 10.

SEPM 12.1.6 (12.1 RU6 MP5, build 12.1.7004.6500)

Endpoint is 12.1.7004.6500.

Any help will be appreciated.

Thanks,