Very surprised MrSaffron didn't think to mention there's an updated firmware that fixes the issue. It was rolled out to users on the top tier many months ago, not sure if it's been rolled out to all users yet.
Sadly that the bad one.... You could try contacting customer support.
May also be worth doing a hard reset on the modem and see if it gets updated over the coming few days
Also when I got the initial update, it seemed to only update in router mode not modem mode.
You need *608 !
R0NSKI (fountain of knowledge)
Tue 23-Oct-18 10:08:42