When attempting to connect an iTach WiFi unit (WF2IR, WF2SL, and WF2CC) to a Netgear Orbi router, you may need to disable the 20/40 MHz coexistence on the Orbi.
Edit: On latest Orbi firmware (tested on V18.104.22.168) only WMM on the 2.4GHz band must be disabled to successfully connect. Thank you Iker for the suggestion.
With newest firmware (tested on 22.214.171.124) you ALSO need to disable "Enable WMM (Wi-Fi multimedia) settings" for the 2.4GHz b/g/n settings (you can leave it enable on 5GHz 802.11a/n/ac).
Network is ok but suddenly device is not locking
Still no issue on my side with Firmware 126.96.36.199.
Make sure to disable the 20/40 MHz coexistence and WMM (Wi-Fi multimedia) settings
For firmware V188.8.131.52, only need to disable WMM.