PC Keeps Randomly Disconnecting from Internet

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jj7371

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I have a Windows 10 PC with an external adaptor to connect to the Wifi. Recently, when online (mostly on Internet Explorer), it will randomly stop working and display a 'can't connect to page' screen when I try to refresh. When I try to use the diagnostics tool, sometimes it can repair it (the error message is 'cannot access default gateway') but most of the time it can't fix it (the error message is 'cannot automatically detect this networks proxy settings'). I can normally fix this myself by disconnecting and reconnecting to the Wifi, but this keeps happening again and again, usually when I try to stream video. Also, sometimes when I try to reconnect, it asks me to re-enter the security key, saying that the information has changed, despite the fact it hasn't. My other devices (phone and tablet) don't seem to have these problems when using the same Wifi.

Any help advice/would be appreciated and if any more technical info is needed please let me know.
 
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WiFi is not reliable. Too much interference.

Does the same problem occur when connected with Ethernet?
 

TerryNet

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WiFi is not reliable. Too much interference.
It is just plain wrong to say "too much interference" when you have no idea if there is even a tiny bit.

Interference is indeed a possibility, but with the symptoms given no more likely than incorrect driver, defective adapter or weak signal.
 
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Okay then, how about "too much interference is possible".

Wikipedia: WiFi > Interference
Interference

Wi-Fi connections can be disrupted or the internet speed lowered by having other devices in the same area. Many 2.4 GHz 802.11b and 802.11g access-points default to the same channel on initial startup, contributing to congestion on certain channels. Wi-Fi pollution, or an excessive number of access points in the area, especially on the neighboring channel, can prevent access and interfere with other devices' use of other access points, caused by overlapping channels in the 802.11g/b spectrum, as well as with decreased signal-to-noise ratio (SNR) between access points. This can become a problem in high-density areas, such as large apartment complexes or office buildings with many Wi-Fi access points.

Additionally, other devices use the 2.4 GHz band: microwave ovens, ISM band devices, security cameras, ZigBee devices, Bluetooth devices, video senders, cordless phones, baby monitors, and (in some countries) Amateur radio all of which can cause significant additional interference. It is also an issue when municipalities or other large entities (such as universities) seek to provide large area coverage.

For more details on this topic, see Electromagnetic interference at 2.4 GHz.
Even bad electrical connections can cause broad RF spectrum emissions.
 

jj7371

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Dec 12, 2018
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3
I have a PC downstairs which is connected with ethernet, which works fine. I have problems with the internet on the upstairs one, even when I'm not using other devices. The only other devices using wifi are 2 tablets and 2 phones. This problem only started a couple of months ago, the upstairs PC had no problems using wifi before then.
Also, the error messages changed recently. Now it's mostly 'default gateway is not available'. Occasionally it's 'doesn't have valid IP configuration' or 'investigate router or broadband modem issues'.
 

TerryNet

Terry
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So, it seems that you are not interested in starting troubleshooting by determining whether you are dealing with a wireless issue or a more general problem, and want to assume a wireless problem.

What is the brand and model of the wireless adapter?

Is the installed driver the latest from the manufacturer's web site (not whatever Windows decided to install)?

Please attach a screen shot of the Networks page (don't collapse the Radar, Connection or Signal History) of the Xirrus Wi-Fi Inspector. If you need help with a screen shot see TSG Posting a Screenshot. FWIW to take screen shots with Windows Vista or latter I prefer to use the built-in Snipping Tool.
 
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