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Hi - did you do a 'power down and power up' restart or did you do 'a paperclip into the restart hole with modem power on for 10 seconds' restart? If the later and no change to circumstances, might be worth contacting Optus support and get them to remotely diagnose the modem to verify if there is a technical problem with the existing modem. They should replace your modem if there is a fault with it.
It may assist you with Optus if you have information from the Command Line Console screens using [ifconfig (if Apple)] or [ipconfig/all(if Windows)] to confirm the wireless device has an IP address, is using the Modem as the DNS Gateway for connection to the Internet and also in the same screen, [ping google.com] for any connection information.
It seems a hard reboot (with "pin" reset has done it.
After about 10 minutes, everything was back and working.
Thanks @Mkrtich !
Hi - do you have ADSL or NBN FTTN and can you make and receive telephone calls when you have no Internet? If you have either of these services and have a spare telephone cable, can you replace the existing one and see if DSL LED stays on or check the firmness of the existing connection at the wall socket - the terminations inside the socket may also need inspection. If you have ADSL, check the line splitter (not required on NBN) connections are firm and if you have a spare one , also replace it.
Can you connect to the Internet via a LAN cable connected to a PC or is it just not connecting when you use Wi-Fi? If no improvement, suggest you contact Optus so that they can diagnose the problem, rectify it or replace the modem. Hope this helps.