So my aunt recently bought a new smart tv at Costco for her room. We’ve ran tivimate on a 4K fire stick and everything runs smooth as butter. Then I come downstairs, bought another fire stick 4K and install the same thing as well as an Ethernet adapter and I am faced with buffering issues. Keep in mind our tv is years old (Mitsubishi)
You're saying you took the same firestick and plugged it into the downstairs TV and then got buffering? Or the downstairs has a second firestick?
To answer: your TV won't have any effect