If the above occurs; as the title suggests, the first thing to do is to “disable the affected skill and re-enable it” in the Alexa app.
My incident involved Alexa saying that my ADT security system commands (arm/disarm) were not being initiated when in fact they were. Alexa would say “ADT is not responding please check the device’s network connection.”
The visual indicator on the ADT panel would indicate that the command had been executed. To verify I purposely tripped the alarm to confirm even though Alexa indicated otherwise. To make Alexa respond correctly, I performed the step mentioned at the beginning of this post. I again tripped the alarm to verify.
This tip (as a first step) may save you the frustration experienced if deleting and reinstalling the Alexa App and/or the app linked to the Alexa skill has been your go-to step in the past. We all know that deleting/re-installing apps is a PITA. 