Modem reboots several times a day since changing over digital phone

Since the modem rebooted Friday 9th Jan roughly around 9am for the "digital phone" change over, the modem has been constantly rebooting 2~4 times a day. It's getting beyond a joke now. Even unplugged the phone over the weekend as I thought maybe there's some interference because it's been running smooth for months. Tried the 0800 561 0061 and just says no known issues. Checked network logs, there is absolutely nothing in there around the times it keeps happening, couple from last year, and just one "No Ranging Response received - T3 time-out;" but isn't even close to the time it restarted. It's a full reboot as well, not just dropping. Admin panel shows the uptime as a few minutes every time.

If you're checking the account, you'll need to check the account related to this IP address, and not my registered email address.