Keep getting kicked off internet. When I try to sign back in to my wifi it says my network configuration has changed. Help, please.

I can't seem to get connected to my wifi internet connection. I seem to get bumped off sometimes when another device in the house uses the wifi. And, my computer sometimes gives me the message that another user is on my internet. I have called Bell...they say all is working. My wife's iPad connects. Her pc connects, my iPhone and iPod connect.....not sure what is wrong. Any suggestions?