Saris H3 vibration felt via drivetrain

Hi all, I recently bought a Saris H3 trainer - my first smart trainer coming from a wheel on Kurt Kinetic fluid trainer so no experience with electronic trainers. I noticed that everytime the resistance kicked in on the H3, I can sense vibrations through my drivetrain, like the flywheel was rubbing against something, but when the resistance drops between intervals, it goes away. And it is not a constant vibration but repeats a couple of times or so with every rotation of the crank. part of me thinks it is the resistance mechanism (no idea how these machines work internally)…anyone experienced something similar? appreciate any insight!