We no long field or offer them and if folk ask for help we defer to the maker. You can try latest firmware in all WiFi products but here I always go with the more solid WAP over powerline or Ethernet.
Example favorite follows.
Your story sounds like a solid warranty issue.
I've always had trouble with repeaters in the past but now I'm just going insane.. (they never seem to work as advertised)
I have a router (Huawei HA35 provided by my ISP) and a router set up as a repeater (D-link DIR-809) to boost network in my bedroom which otherwise only works in a corner of the room at <2mbps speeds.
DHCP is set from 192.168.1.5 to 192.168.1.254 on the HA35.
DHCP is off on the Dlink.
HA35 has the IP of 192.168.1.1.
Dlink IP is set to 192.168.1.2 for WAN and 192.168.1.4 for LAN.
Subnet is set on both to 255.255.255.0
Everything works fine, until the evening.. when I go to bed and my devices switch automatically from the HA35 to Dlink.. it sometimes crashes the whole thing.. devices whatever they might be connected to (HA35 or Dlink) have no internet access.. I can access both the DLink & HA35 control panels but thats it. And once this happens everything locks up.. The only way I've found to get it working again is to reboot the repeater..
I'm guessing I've messed up a setting or forgotten about something but.. what?
Any help would be greatly appreciated!