Why flight stoped above the ground and disappeared

[Williamrjw]

When I was watching a history flight, It stop and nothing else I can see.

[SammySkycrafts]

Because it would have gone below where your feeder had coverage. tar1090 shows the data from your feeder, or in the case of ADS-B Exchange, shows data from all of their feeders.

1090 is live is sight, so if there's a bunch of buildings blocking the path betwee you and the aircraft, your unlikely to see it.