If your Linksys RE6500 extender has been functioning poorly after Linksys re6500 setup, check its power connections with your router and the extender as well. Make sure to upgrade the firmware of both devices to the latest version to take the privilege to use the fix on the most recent bugs and the latest changes. Arrange the extender position to reduce obstruction from other things and make the signal the best. Change the Wi-Fi channel on the router because it might be congested with traffic. If the problem persists, try resetting the factory settings and setting it up again following the instructions step-by-step. If all fails, reach out to the Linksys support service for assistance.