Loud squeaking

My vacuum has worked well for a few months, but now the vacuum is making a loud squeaking sound as it cleans. When moving straight forward it seems to be fine, but when maneuvering in any other way it squeaks/whines a high pitched “squeal.” Anything I can check or adjust? It is in vacuum+mop mode, but when not moving there is no sound. So I don’t think it is the mop pads or rotating brush, I think it may be one of the wheels that allow it to turn? Help! It is extremely irritating!

I disassembled the front wheel, cleaned everything, and then put a little lithium grease on the metal pin and slid the wheel back on. Been good for a few months now.

This could be debris within the omniwheel assembly causing the squeak during turns. Double check to make sure it's clean and clear of debris such are particulates and hair.