Had issues with our old Asus router, so we bought an AX10, set up static IP for my ISP, WiFi, and then we had internet, and I upgraded firmware as it asked me to do so. For a while it worked. Then, exact same issues as my Asus router, weirdly enough: Suddenly all connected devices lost connection with the router(s), I couldn't connect to the setup page on either router, only thing that solved it was rebooting the router. ISP could ping the modem, so this was purely a LAN issue.

Now, on the TP-Link, I get either 0 lights, or a blinking power light, potentially this light stops, and a orange internet connection light shows up instead, but this hasn't happened for some time now.

Tried resetting it, power adapter gives me 12.3V, sockets are at 232V, so everything works fine on that end.

No idea why the first issue happened to two different routers, and no Google search answers the second issue.