Why is the auto off not working on my original Acaia Pearl?

Before v1.5 will go to sleep when the following conditions are met:

1. An app is not connected to the scale.
2. The timer is not active.
3. There is less than 2 g on the scale.

After v1.5, we changed the conditions, please meet all the following conditions:

1. No touch key operation.
2. No apps connected to the scale.
3. The timer is not active.
4. Any weight less than 2000 g that does not change more than 0.3 g.