Router Issues {can connect to wireless on one device, not the other}

Hello everyone, this is my very first post on this website so I hope to get some good responses!
So heres the deal:
My PS3,my ipod touch, and my dads ipod touch is on my wireless. and every once in a while my internet stops working on both my ipod and my ps3 after anything gets unplugged on the router but for some reason, the wireless internet still works on my dads ipod touch. everything is connected with static settings I do not know how to fix this, my dad says that it has something to do with a setting that keeps getting reset, he has fixed it before by doing something in cygwin or command prompt I think its called.Anyway, I've tried pinging my ip address on my ipod but I get no response. I would greatly appreciate if you could help me out with this.
Thank you

-Stephen