High pitched sound

My Dreame L40 ultra started making a high pitched sound while cleaning. We cleaned and oiled the front wheel which seemed to help for a minute but then the sound continued. We emptied the vacuum filter as well but did not help.
We’ve had our vacuum/mop for a month now and use it almost everyday.
Please help me figure out how to fix it, we absolutely love our Dreame but cannot stand the high pitch sound, it started about a week ago.

We have also had ours about a month and are noticing a high pitched squeak too! It sounds like it’s coming from a wheel. We have turned the Dreame off and rotated all the wheels to check for disruption debris and rotation failure but all seem to be good and working just fine. Filter has been cleaned also but noise still persisting.