I was cleaning out my laptop and getting rid of some junk when I found an old batch file I had written to repair LAN connections. It works great, but only releases/renews the IP. Just save the code below as a .bat file and execute it in Windows whenever your Internet is acting up.
@ECHO OFF TITLE Repair LAN by Paul Stamatiou ipconfig /release ipconfig /renew ECHO. ECHO LAN IP REPAIRED. ECHO. PAUSE CLS EXIT