Model :

Hardware Version :

Firmware Version :

ISP :

Hardware version: Archer C7 v4.0
Firmware version: 1.0.5 Build 20171101 rel.37754(5553)
Operation Mode: Access Point mode

When connecting to 5Ghz wifi and run speed test ( http://speedtest.net), wifi will hang on upload test every time.
After that, all internet connection hangs until I switch to 2.4 band and then switch back. Hanging also happens randomly sometimes.
I think this didn't happen before I upgraded the firmware from the factory version.