Roller brush cycling on and off

Anyone have issues with the roller brush cycling on and off while vacuuming carpet? Mine just started doing this on (low and higher pile) carpet. Is this normal or am I just noticing this for the first time? Is my vacuum defective?

Mine also does this. 1-2 seconds running the brush, then brush stops… rinse/repeat. Didn’t do it in hard surfaces. I know it’s the main brush that’s stopping because I slightly raised up the vacuum while it was running around and could see it stopping and restarting. Relatively low pile carpet (read: not super expensive)

I should note that it did this straight out of the box. Bearing is in place, clean and rotates freely.