2wire modem connectivity

having a problem where i get a solid connection and all lights are on but sometimes for 10-15 seconds its like i loose connection but all lights are still on altho not blinking anymore. it happens while online gameing, talking on vent or browsing websites. when this happens im still in game or whatever and its like the 10-15 seconds that i miss allcome back in 1 jumble in like 5 seconds. this happens all all 3 comps,2 conn wired and 1 wireless. also 2 wired have been reformatted and all have firewall/virus protection and an sure there are now p2p or viruses.