Well yes, because of the newer download speeds coming up. Mine was rated for 43 Mbps I managed to get 47 Mbps out of it. Best to reset the modem if it's giving you problems or you think it's way to old.
What's your transmit power: 48.2 dBmV this is mine. You should be able to pull up the Cable Modem Status screen: Default is 192.168.100.1