@johno1234 The power supplies on the Smart Modem's die often from experience. If you've got another 12v, 2a power supply then you can quickly test this theory.
Also have a look at Grandstream routers and they're more feature packed than the TP-Link. This wee router (and I mean it's tiny) has great WiFi and can mesh either wired or wirelessly with other Grandstream routers or access points: https://www.gowifi.co.nz/grandstreamnetworks/gwn7062e.html
They're currently on deals at PB for $95.14 each: https://www.pbtech.co.nz/product/NETGSM26101/Grandstream-GWN7062E-AX3000-Dual-Band-WiFi-6-Route
You're getting better value for money and more features than the TP-Link routers.
