Diagnosis
This is normal operation. The eero 6 has no internal fan. It dissipates heat through its plastic casing.
How to Fix It
Ensure it has adequate ventilation. Do not place it inside an enclosed entertainment center, on top of a cable box or game console, or under stacked papers. Leave at least 2 inches of clear space on all sides, especially the top. Place it on a hard, flat surface. Do not mount it vertically unless using an official stand that allows airflow.
If That Didn't Work
If the unit is too hot to keep your hand on comfortably for more than 10 seconds, it may be defective. Unplug it and let it cool completely. Plug it into a different outlet on a different circuit. If it immediately gets extremely hot again, the internal power supply is failing. Contact support.
Heads Up
Heat reduces component lifespan. Consistent overheating will shorten the device's life. Good ventilation is the only preventative maintenance for this product.