I need some network help

ok im staying at my gfs house due to mine being damaged by sandy. and her router randomly disconnects us or we can connect to the router but have no internet. its a dlink 108g mimo router and a comcast sbv5220 modem.( i wish i had my fios here)

now heres the weird part when i try to get into the router settings it disconnects everything before i can get in.(basically i type in 192.168.0.1 and boom no internet.

anyone have any solutions? btw i can post the modem logs if needed cause i can get that to come up.

thanx

edit: i forgot to mention we do have a lot of wireless devices(2 android phones, 2 iPhones, an iMac, a gaming pc, 2 xboxs, and macbook pro. but im the only one home and still experiencing these problems with just my macbook pro and iPhone.