Spoilt LAN Line
Did you know that your network cable can actually spoil quite easily if you always take it in and out? I didn't and used to think that the culprit was my home internet modem whenever I had connection problems. It turned out that my network cable was getting spoilt because I constantly changed it from the desktop to my laptop. So, if you use a network cable or a LAN line, try to use it only for one device and not swap it around too often.