Everything is fine before, right? Any power surge？ It seems that unit is fault, please contact your retailer for the replacement.

@SRHaddon It's suggest to set different wifi name on RE305, then you can easy choose which one to connect on your device. Acutally, all your devices( phones, ipad) has their rules which wifi to...

@Thriftmmd4 Check this: How to hard reset TP-Link wireless access points, extenders to factory defaults

@jimenabpose Normally, after reset extender, RE will act as DHCP server and the IP should be 192.168.0.254. And the devices connect to extender will get IP 192.168.0.X So maybe the reset failed. For...

RE305 2.4G and 5G wifi both has the same issue on your two laptops?

No, In Repeater mode, extender connects to router via Wi-Fi. In Access Point mode, extender connects to Router LAN via Ethernet cable.