Mixman1 wrote

515D kit. Installed and operating perfectly for a couple months. Lately it has started dimming itself when on. For example, if I turn it on at 75%, a couple hours later it will be at 35%. 
 

this particular switch was set on a schedule to come on at 75% every evening for several hours. Day 1 it would come on at 75% then go off at the set time at a much lower %. The next day it would come on at the lower % and then go off at 1%. It happens when used aside from the timer as well. Manually turn on at 100%, several hours later it will be at a much lower %. 
 

I have done a full reset twice. Checked for firmware update. Can't fix the problem. 

  @Mixman1 

Check your automation settings in the Tapo app. Did you create any rules that might be causing this? *Open switch's device page in the Tapo app, swipe down and click Smart Actions, check the 'Involved' section.

Also, if your device is connected to Alexa, Google Home, or another third-party platform, review any automations or routines you’ve set up there.

When the light dims, do the brightness indicator on the switch and the brightness level shown in the app both update to the new, lower setting? Or do they still display the original brightness even though the light itself has dimmed?