ECOVACS Deebot X2 Omni - Loud Noise - Main Brush Motor

Issue Summary:
The Deebot X2 Omni robotic vacuum cleaner generates an unusually loud noise during operation. This noise specifically occurs when the main brush motor is running. Despite troubleshooting and making several adjustments, the issue persists.
Troubleshooting Steps Taken:
Removed Mopping Pads and Side Brush:
To isolate the problem, the mopping pads and side brush were removed. This helped in determining that these components are not the cause of the noise.
Main Brush and Motor:
The noise occurs consistently when the main brush motor is engaged.
To further identify the source of the problem, the main brush was replaced with a brand-new one. Despite this replacement, the loud noise continues.