Strange... Be sure you are using good cables and they have good connections. Also power cycle all of the devices involved especially after any changes. If still an issue, do a factory reset and...

Use the MAC's built in WIFI scan tool so you can see the country code before you connect to the router. Power cycle the router, with WIFI on, press and hold the option key and click the WIFI symbol...

In debugging speed issues, the first step power cycle the modem, router and the PC. To ensure you are getting the speed from your ISP, bypass the router and connect a PC to the modem via ethernet and...

Does your router's guest network support a schedule? If so, move them to the guest network. Also, there is the simple electronic timer plug so the router is powered off and on at set times. Just do...

I agree with pkz78 that sounds more like the router than the MAC from what I have read. Use the MAC's built in WIFI scan tool so you can see the country code before you connect to the router as...

The 2.5 band will have better range but is slower than the 5 GHZ band. In my experience, extenders will have slower speeds than your main router just by the nature of how they work. They either share...