After doing the Wavlink AC750 setup, if you are facing slow speed of the internet continuously, then there can be any technical glitch. That error can be for a short period of time that causes you to face working issues. So, to get the extender working back, you must try to power cycle the extender once. Doing so will allow you to get rid of that temporary issue for sure. But, keep in mind to leave and keep the extender unplugged for some time. So, just take the extender out from its power socket and unplug the router too. Meanwhile, check the networked device’s working and the web browser’s compatibility. Later, plug the extender again into another electrical socket and choose a different location this time. Once you plug in the extender, check the LED on its panel and also check the working of the network.