My robot keeps screeching occasionally

My robot keeps screeching occasionally

My robot keeps screeching occasionally
My robot keeps screeching occasionally
Saturday
Model: Tapo RV20 Max Plus  
Hardware Version: V20
Firmware Version:

Starting today my vacuum was on when it started making this diabolical screeching noise. Only happening occasionally but it is a terrible noise! 
 

I've checked all wheels and the main brush and nothing seems to be obstructing it. What could it be? 
 

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Re:My robot keeps screeching occasionally
Yesterday

  @Lgracesh 

 

When the problem reoccurs, try to remove the main brush, side brush, or the caster wheel, one accessory at a time, and verify if any of these are the reason for this problem. Please record videos when performing the tests, in case it is needed for further analysis.

 

Check whether the main wheel and caster wheel are tangled.

 

What type of floor do you have at home?

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