@IP192 Try to adjust the antennas to see if the signal would be better when you are near the router at around 2-3 meters.

@captbaldo Can you see Reboot option on Tools->System page on Tether App? Or try to disconnect the router from your modem and then connect them again to see if internet will restored.

@DarkRager Try changing WiFi channel and channel width on the Archer C5, if the WiFi LED still turns off on its own and WiFi signal disappears, the device might be defective.

@abuyamjar You mean no signal at all or signal is the same as that when using internal antennas? Also make sure the supported LTE frequency range matches the MR105.

@GregZaaa You coud follow this guide to troubleshoot: What should I do if connection is not stable when the device is connected to TP-Link Powerline Adapter?

@abuyamjar It seems the MR105 uses internal antennas by default, for the external antennas to work instead of the router’s internal antennas, you need to enable external antennas on the web page.