When I turn on Laptop I have no internet until I restart the router.

[M-Zangeneh]

Every time I start my laptop, it is connected to wifi but has no internet, unless I restart the router once. Troubleshooting message says: "WiFi does not have a valid IP configuration."
Restarting fixes the problem, and the internet is there until the next time you log into the laptop.

[dks]

Thank you for your question. What operating system is on your laptop? Have you tried restarting your laptop instead of the modem? Does that fix the problem? 

[M-Zangeneh]

My OS is Windows 10 pro. I have restated laptop, but it doesn't help too. I also tried troubleshooting, no success, troubleshooting message says: "WiFi doesn't have a valid configuration"
Only restarting modem fixes the problem, and the internet would be there, just until the end of current session, next time I open the laptop, no internet.

[dks]

Thank you for the information. I suspect that your issue is morel likely within Windows 10 and your WiFi connection and not with the modem or Bell. There is a really good diagnostic article from Microsoft here that will help diagnose any wireless connection issues. Try the outlined steps in order and let us know if it worked. 

[Vanadiel]

Is it connecting properly after logging in, or does it stay disconnected once logged in?

[M-Zangeneh]

Yes, each time logging in, the WiFi is connected "properly", secured, but no internet. Thx.

[Vanadiel]

Instead of rebooting the router, try a disconnect and reconnect of the WiFi adaptor.

Wifi 

Make sure the option connect "automatically" is checked.

[M-Zangeneh]

Thanks for your comments
I followed your instructions, but the situation remains the same.
Also, what I forgot to mention is that the 2.4 GHz band (EXT-G) is fine and the connection works properly, the problem occurs, only when I switch to the main WiFi band (5 GHz).

[dks]

That is most likely a distance issue from the modem. The 2.4 GHz internet signal can travel further than the 5Ghz wireless signal. You may have to stay on 2.4 GHz. 

[M-Zangeneh]

Actually, distance can't be the issue, because I've already tried my laptop by moving it beside the router, but no luck.

[dks · Accepted solution]

If distance is not an issue, then it is possibly the laptop. Did you attempt to delete the wireless connection entirely and setting it up again? Did you run the Network Troubleshooter in Win 10? What results did it give? There is also no "main" wi-fi band. The computer finds the best possible connection. If it is 2.5 Ghz, fine. If it's 5 Ghz, that's just fine. 

[M-Zangeneh]

No, I haven't tried your points on my laptop.I will follow your comments and provide the result. Thanks.