Why does my Huawei bracelet B5 sometimes fail to receive message reminders?

I didn't receive the message reminder, which may be caused by the following reasons:

1. The bracelet is in "Do Not Disturb" mode and during the "Do Not Disturb" period.

2. The mobile phone will not push new messages to the bracelet during use, and the mobile phone notification bar will not display messages at this time. 3、

When the bracelet is on, there is a message to remind you not to vibrate.

4. When the interval between continuous receipt of multiple messages by the bracelet is too short to 12 second, the newly received message reminder will not vibrate.