Late to the game but if it helps anyone else in the future, I just dealt with this even after I made sure the brushes were clean. I have long hair and a dog so I knew there had to be little some pocket of hair in there that I couldn’t find.[br]
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What fixed it:[br]
I took the whole thing apart to give a good cleaning but two things made a WORLD of difference[br]
1. While disassembled, I popped the front wheel assembly off and then took the front wheel out of the assembly. The metal posts that hold that ball in the assembly where completely twisted with hair (like a spool of thread). I was able to slip the hair right off and then pop the wheel back in the assembly[br]
2. This one was HUGE: On my particular model, when you remove the brushes to clean them, there’s the square end and then there’s the other end with the two plastic prongs (mine is green and yellow). On a whim, I pulled off the yellow prong part (the side opposite of the square end) and BAM: dense spool of hair. I have no idea how it got into that tiny little space but removing it from both brush assemblies completely fixed it for me. Good luck!