First, we need to find out whether this issue is related to one or more devices connected to this service.
Make sure all internet cables are connected properly to the ports found at the back of your modem. If everything looks good, check the device itself and whether there are any pending software updates.
Test your internet connection by logging into MyGO. If the test shows no issues, try disconnecting and re-plugging the internet cable from the modem to the telephone socket and check your internet connection again. If the issue persists, make sure that cables from all of your devices are connected to the modem in the ports found at the back of the modem.