what is the cause of this strange wifi problem?

My laptop has been experiencing sudden disconnections usually at around 8pm pacific time. The wierd thing is that no other device in the house experiences this problem, and also the solution seems to be unplugging and reconnecting the cable or resetting the network, and not changing any settings on my laptop.(although this usually only fixes it temporarily). It says something about an invalid ip address every time it happens. At first i thought the problem was my laptop, but it cant be if resetting the modem can solve the connection problem. I also thought it was the modem, but only my laptop seems to go through this, and no other device in the house. Location is not the problem as well, because my phone(s4) can connect to it from the same location. My laptop is a Dell Inspiron, it is about 3 years old.