I have dual channel wifi with both 2.4 ghz and 5 ghz.
Never had this issue with other devices in my network.
I will continue to monitor this issue and report if I find any pattern.
Im having the same issue. Wlan full signal but can't visit websites or watch YouTube. Other mobiles phones are still working at the same time.
After 5-10 minutes the issue disappears again. But it is happening frequently and is quite annoying.