Samsung S21 FE Vibrates Randomly Without Notifications

I am experiencing a strange vibration issue with my Samsung S21 FE. Even when there are no notifications, the phone randomly vibrates with a soft buzzing sound. I have disabled vibration for all apps, yet this issue persists.

I need to understand why this is happening and how to fix it. Could it be a system glitch, background process, or a hardware issue? This is frustrating because it happens sporadically, and I can’t figure out the cause.

Samsung, I expect a clear explanation and a solution. Has anyone else faced this issue? Please provide troubleshooting steps or a software update to resolve it. I need urgent assistance!