The Short Version
This claim is false. NASA has explicitly stated that a solar eclipse has "no unusual impact on Earth's gravity" and that Earth cannot "lose gravity" without losing mass. The claim originated from a viral social media conspiracy post. While eclipses produce tiny, ordinary tidal variations in local gravity (on the order of 0.0000178%), this is not a "loss of gravity" — and certainly not a seven-second global shutdown. No credible scientific evidence supports this claim.