Cannot Connect to Internet
Incorrect WIFI driver
It’s possible that the WIFI driver installed by Windows or Windows update
Weak signal 2.4ghz , longer range than 5g
Most routers these days are dual band and will operate at 2.4ghz and 5ghz. While the 5ghz is faster and has greater bandwidth but it’s signal strength at distance is more prone to weaken as compared to 2.4ghz
Wifi switched off
Your might be in flight mode, have a physical switch or key , or misconfigured driver.
Too many users using WIFI
The total WI-FI bandwith is shared amongst all of the people using it and so the effective speed of all users can be affected by one user who is downloading or streaming. There are settings in modern routers which can contain the amount of bandwidth used by any particular application.
Too many apps connecting to Internet
Your laptop can become sluggish if you are running too many processes accessing the internet , common examples are conferencing apps ZOOM, TEAMS remote access TEAMVIEWER , backup apps eg onedrive. Often these programs are being run automatically at startup
Using a VPN will slow down internet
Virtual Private Networks are often used in the attempt to preserve anonymity however the extra time taken to get to these servers and for them to obfuscate your IP address has an affect,
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