Repeatedly attaching and detaching the spout (drinking spout) may cause the root to wear down and come off quickly.
In this case, please replace the lid. You can purchase it from here.
If the lid comes off immediately after use, that would be considered a defect, in which case please contact us via the contact form.
Q. The spout (drinking mouth) has come off easily.
For more questions, please contact us via the contact form.