Depending on router of course; You can make a guest network, limit guest clients to themselves (block them from communicating with other guests and most imprtantly; Cant access with your main...

If you use wifi to connect to the router: I had this with Windows 10 and Archer C1200. I didn't even to restart the router, simply disconnecting wifi (on the computer) and reconnecting would bring...

If your devices are having trouble connecting, make sure your router is using B/G/N/AC mode.

The technician is correct. If you are using wifi, those rated speeds are speeds that are in 100% perfect condition. This never happens in the real world. However 5ghz will give you above 250mbits...

It doesn't update on the C1200 either. It's fairly useless currently, and I blame the new firmware they started using.

Try disconnecting in Windows, and then reconnect. I'm sure the router is just fine, it's windows messing up.