ps3 wii fi

my internet is really fast, i got a wireless network and my house dosnt usally use the internet, just me

when i play ps3 online, its perfectly fine, first time ive used to wii-fi internet

i press multiplayer on cod5 and connect with wii-fi, takes 2mins, then i play a match, and every 2-8mins the wii-fi dissconnects, im always on cod5, and when it dissconects it dosnt save my level/exp

so please help me sort it out