Has it been raining for the past week since I read on forums that rain can make wifi slower and less reliable according to
http://wi-fi.tribe.net/thread/a9e2aaf2-cdb4-43bf-a0f2-e53ea3e891ac
Usually when a wireless router fails, the wireless disconnects at random times, and you need to unplug and replug your router from the wall's power to turn the wireless signal back on, or wireless can't be turned back on again because the router is dead.
A microwave, baby monitor, cordless phone, and other electronics could also make your wifi worse because they all may use the same 2.4GHz channel.
You can try changing the channel of your Wireless signal to 1, or another number. Sometimes unplugging your router for a few seconds from the wall's power, and replugging it back in can help fix your connection. Moving the router closer to your laptop may help.
It could be your laptop wifi card not working well with your wireless router. Sometimes using an external USB wireless adapters with a better antennae can make your wifi better.
http://www.youtube.com/watch?v=T7CzMygJ0Jo
If your other wireless devices like game consoles, tablets, smartphones, and handheld consoles have faster wireless speeds, than it may be your laptops wireless card not working well with your router, or the Wifi card is not very good.