Hello @WiggidyZooty
Thank you for reaching out to us and welcome to the TP-Link community.
I believe the support agent replied to you on 28 Jun, and the ticket ID is TKID220626971, but I'm not sure why you didn't receive the reply, please check and ensure you are not rejecting some unknown emails, you can also check the junk mailbox.
Back to your questing, do you mean the router loses the connection and you need to reboot it every 30 minutes? How are the two routers connected to the network? Are both working in Router mode? When the internet stops, are the internet LEDs on both routers still green?