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I'm not familiar with the Wemo plugs, but it does sound like either there is a fault with the plug itself or they screwed up the Wemo app like Amazon occasionally does with the Alexa app. Either way it sounds like it might be beyond help at this point.
However, I will make one suggestion. As an amateur radio operator (ham) I can tell you that radio signals do not deal well with metal. Metal can screw up signals and even completely block them. You mentioned using the plug with a fireplace insert which makes me wonder if all that metal near and within the fireplace could be interfering with the radio signals being sent back and forth between the WiFi router and the plug. You might try an experiment and move the plug to an outlet away from the fireplace just to test this out. If the plug starts working correctly again and has decent connectivity with its app after being moved, that might indicate that the metal is interfering. If it is the metal, then repositioning the plug or the router might be a solution. You might even be able to use an extension cord to move the plug farther away from the metal fireplace and insert.
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