Problem:

The phone keeps vibrating even though no operations have been performed.

Cause:

1. The phone's vibration mode has been triggered due to software exceptions.
2. The motor circuit keeps running due to hardware issues such as short circuits caused by water entering the phone.

Solution:

1. Restart the phone and check whether the issue is resolved.
2. If the issue persists, back up your data and take your device and proof of purchase to an authorized Huawei Customer Service Center for assistance.