If anybody is facing vibration problem in their galaxy devices, e.g. Phone not vibrating some times, So here is a solution which worked for me and it is that U have to Disable the "Google" app from settings, restart the device and then see if it works.
We acknowledge your query and apologize for the same. We request you to kindly visit the service center for a physical inspection of your device. You can locate your nearest service center with this given link: https://www.samsung.com/in/support/service-center/
