Is the modem/router plugged directly into a wall outlet or into a power strip? If the latter, try the former.
Can you access the modem's signal levels (probably 192.168.100.1)? If so, what are the significant numbers when the network is working and what are they when there is a problem?
Can you access the modem's signal levels (probably 192.168.100.1)? If so, what are the significant numbers when the network is working and what are they when there is a problem?