First, check all physical connections and cables. See if everything is firmly connected.
Check any power supplies as well. Swap out any cables with known working cables.
Then check your Netgear router logs and Event Viewer logs. See if you can find some relevant log entry with an error code or message.
It could some physical problem with the connections/wiring or maybe your ISP has a problem. Sometimes, this issue often related to power settings & OBSS.
Look into your computer's power settings. sometimes the computer sends the WiFi-card to low power and this causes problems with some APs.
The same can be happening with OBSS or power save modes in your router's WiFi settings.
I suggest you check this first as this is easily done within 2 mins.Hope that helps!
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