I've faced basiccally two kind of problems. Am I received a faultly product? Sometimes in some of my connected devices showing "no internet access" but at the same time the other routers connceted wit

Hello i have a lots of question please first why i cant chose WDS 5G second when i try with 2.4 ghz my internet 2.4 ghz not stable ,, every 10 sec not working ,, and for 5ghz stable settings wireless