Modem recommendations for Australia

Hi all. I’ve just started crawling with HA and love it so much. My setup is very basic so far. The issue I’ve had recently is with my ISP (TPG ARCHER 1600v) modem is not keeping my devices IP, after a power failure or modem reset. Can someone give me some options or recommendations to try. At the moment I am only able to assign 1 static IP via the modem settings that I can see. Thanks.