Huh!
After all the replies from here, wala pa jud ma-fixed?
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Dili jud ni IBM Thinkpad imo laptop noh?
Im asking this because most IBM thinkpads have this problem.
Most especially the not so latest models.
Thinkpads got this exact behaviour.
Mo-connect for a few seconds or minutes, nya mo-disconnect dayon.
Since you did not answer my question, dili siguro thinkpad imo laptop.

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Dili kaha
duha imo Antivirus?
If duha, uninstall ang usa.

Check sad imo TCP/IPv4 settings.
Tan-awa daw, basin naay naka-assign nga
IP.
Dapat wala sulod tanan. Dapat
Auto Detect na.
"Obtain IP address automatically"
Same with the
DNS.
Dapat auto or unfilled na.
"Obtain DNS server address automatically"