Access the extender http://tplinkrepeater, you will find DHCP server. If you cannot access it, find out the IP address of extender on the router and use the IP address to login the extender.

I don't know what the log tell us. Do you install the latest firmware of the router? Make sure your modem conneciton is stable.

So you removed the default external antennas? Those are 4G signal antennas. The main signal strength depends on the sim card and the ISP. I don't think changing any settings on the router would make...

Do you install the latest firmware of the router? You download through WiFi or Ethernet connection? Both gave you the issue? And all your devices have the same issue? Would the internet automatically...

you can report the problem to tplink support and send them the log to analyze

you can click Get from PC, but it won't get from internet or GMT. working as extender, there isn't WAN gateway, the NTP server would not update