PC loses internet randomly - help needed to troubleshoot

  1. Damun's Avatar
    Posts : 164
    Windows 10 Home, 2004
       #1

    PC loses internet randomly - help needed to troubleshoot


    I have this setup at home:

    ISP Modem/Router (in bridge mode) - Asus RT-AX86U (router) - Ethernet Cable (approx 3m/10ft) - Desktop PC (Win10)

    During the last couple of weeks my PC has started to lose internet connection. The problem disappears after a reboot.
    It has happened 6-7 times now - apparently randomly.
    The connection can be lost while idle or while surfing.
    Only my PC loses internet (only one connected to the Asus router by ethernet). WiFi still works and internet is accessible by other devices.

    I have tried to run the network troubleshooting utility in Win 10 the last two times it happened.
    First time it reported a problem with DNS.
    Second time (today) it reported no ethernet cable! I haven't touched the cable in at least 6 weeks.

    Today i decided to do a network reset in Win 10.

    Logs in the Asus router do not show anything at the time when internet is lost
    System log in windows does not show anything. But perhaps i am not looking in the right place.

    Is there anything i can do to narrow down the cause of this problem? Specific logs to look at?
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  2. Samuria's Avatar
    Posts : 6,187
    windows 10
       #2

    DNS problem can be DNS or just no internet but set DNS to 1.1.1.1 & 1.0.0.1
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  3. Damun's Avatar
    Posts : 164
    Windows 10 Home, 2004
    Thread Starter
       #3

    Samuria said:
    DNS problem can be DNS or just no internet but set DNS to 1.1.1.1 & 1.0.0.1
    Thanks for the suggestion @Samuria

    I don't know that much about DNS, so forgive for asking: If the problem is DNS, wouldn't that affect all my devices?
    When internet connection dropped for me today, all other devices were still able to access internet without a problem.
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  4. Samuria's Avatar
    Posts : 6,187
    windows 10
       #4

    We have to start somewhere so ruling out DNS is a start. From a CMD prompt typeIpconfig /all

    When it drops do it again to see if it looses it's IP and how long is the DHCP lease?
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  5. Damun's Avatar
    Posts : 164
    Windows 10 Home, 2004
    Thread Starter
       #5

    Samuria said:
    We have to start somewhere so ruling out DNS is a start. From a CMD prompt typeIpconfig /all

    When it drops do it again to see if it looses it's IP and how long is the DHCP lease?
    Thanks.
    So i only change the DNS on my PC, not my router?

    The DHCP lease time is a little over 39 hours:
    Lease Obtained. . . . . . . . . . : 12. maj 2021 18:11:43
    Lease Expires . . . . . . . . . . : 14. maj 2021 09:29:01
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  6. Damun's Avatar
    Posts : 164
    Windows 10 Home, 2004
    Thread Starter
       #6

    My PC just lost connection again.

    Four days ago i did a network reset in win 10
    Today when the internet dropped, the network troubleshooter could not identify any problems.
    Nothing in my routers log.
    All other devices (WiFi) were not affected, only my pc (LAN)

    I did a ipconfig /all on the day i reset the network (4 days ago) and again while my internet was down (today, before reboot):
    Everything is identical apart from lease obtained/expired date/time

    I'll change the DNS as @Samuria suggested - I wanted to see if the network reset would do the trick before changing anything else. One thing at a time....

    Any suggestions to what could be wrong here? LAN-cable going bad?
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  7. Samuria's Avatar
    Posts : 6,187
    windows 10
       #7

    Did ipconfig showing had lost its IP when it drops?
    When it drops from CMD prompt typeTracert 194.119.131.66
    Tracert adobe.com

    Post results
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  8. Damun's Avatar
    Posts : 164
    Windows 10 Home, 2004
    Thread Starter
       #8

    Samuria said:
    Did ipconfig showing had lost its IP when it drops?
    Post results
    Please explain what to look for, i am not that experienced in this area. I did take a screenshot of the results of ipcofig /all, but i don't know if i need to mask anything out before posting here.
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