I bought a Tenda AH302 Wireless Range Extender and sent it to my girlfriend overseas. The reason for its addition to the network is that the router is on the living room and somehow its signal doesn't reach her room. I helped her remotely in setting it up as a range extender wirelessly (same SSID as the main router and didn't use the ethernet cable) and it worked all right for the first day.
But then the range extender's connection dropped and dragged the router's connection down, too. Even after turning the range extender off, devices still wouldn't connect to the router. The only solution is to restart the router and it worked again -- even the range extender.
Then this happened again so we had to stop using the range extender. They never had this issue since.
We're really hesitant on putting the range extender back into the loop. But why do you think this is happening? And how do you think we could resolve this? Thank you.