internet dc

so my internet disconnects about every hour for a couple of seconds then reconnects immediatly
someone said it could be something to do with BIOS so he updated it but the problem remains
i use wireless internet but the problem presist when i use lan cable
other pc's in network dont disconnect
my modem is : Sagem Internet Gateway Device SAGEM_LB_IGD

plz help me ty in advance

if u need any specification feel free to ask