You are going to have to provide a more scientific test run to see if there is a measurable difference, and that includes doing a factory reset on all devices and have the same exact OS, and double check for the same exact input and output settings. This includes making sure ambient conditions do not change during the tests - ceiling fans, lighting, refrigerators, power loads, etc.
... or just do what Prof. Avi Loeb does and say it's an alien spacecraft.
Also you'll need everything involved sitting in a faraday cage. Which is kind of like being in an alien spacecraft. Or so I've heard.