My PC is having issues with connectiong to the internet via my WIFI when the range extender is running.
There are 3 Networks in my appartment:
Router: Wifi 5G, Wifi 2,4G, and Range extender: 2,4G EXT 

my pc is connected to the 5g network, the moment i plug in the range extender my PC is having Problems connection to the DHCP Server (at least that´s what it tells me)
i need the extended network for smart lights, at the moment i have to unplug the extender if i want to use my PC

i need a fix asap...

no info on hardware version, no info on sofware version, Model Number: TL-WA850RE