I have been on the nbn a number of weeks now ...I have multiple devices connected via wifi some using the 5ghz and some using the 2.4ghz because of their age ....I have lost all internet access on all devices connected via the 2.4 ghz ...I've tried rebooting both the router and devices ...but given its all devices this must be either a Telstra problem or the gateway ? Any ideas or do we need a replacement gateway already?