The plug worked perfectly for the first 4 months, but I have now experienced this issue several times.

I can control the plug via both Google Assistant and Tapo app. i.e. the LED on the plug switches on & off and there is an audible click when it does so. However, the plug does not switch power on or off.

Until today, removing the plug for m the app, performing a factory reset on the plug and adding it again to the app fixed the issue. This was inconvenient but fixed the issue. This action no longer fixes the issue however and the plug seems to be no longer capable of switching the power output.  

Is there a different fix?  Or do I need to replace the plug?

Thanks