Well ... if everything works fine between your computer and LAN 2, 3 or 4 except LAN 1 then I am afraid your LAN 1 connector is probably dead !

I have a TL-WR841N V8 wireless router as well and I have no issue at all using the wireless setting. If you have Zone Alarm or Kaspersky installed then please see the FAQ bellow:...

Anyone ?

You can record an Autohotkey macro if needed to open a web page from your PC

I reviewed the description of your problem (router locking up and/or WIFI signal lost)... It is not sure if this is related to a hardware or software issue. Eventually one last thing you could try is...

you cannot redirect but force people using perfect-privacy.com with the "Access Control" feature. You have to enable access control and select "Allow the packets specified by any enabled access...