Water pressure makes the unit turn on and off. If it turning on by itself then could be water draining back into the pump. Water could be leaking from the check valve on the discharge elbow into the pump or from the toilet tank into the bowl. Inspect the flapper on the check valve and the flapper on the flush valve.
SOURCE: The saniflo keeps cutting in even when not flushed
Water pressure makes the unit kick on and off. It will turn on by itself if water is somehow draining back into the pump. It could be water leaking from the toilet tank into the bowl and from the bowl to the pump or the flapper on the check valve inside the discharge elbow may be stuck open or could be defective and allowing waste water to drain back into the pump, once it builds up enough water pressure inside the pump, the unit will kick on and off by itself.
SOURCE: NOISY SANIFLO
Always an issue, guessing it is on a tiled floor? or up against a tiled wall?
I put some thin foam / Bubble wrap underneath and behind mine to dampen the vibrations. It also helps if you box the unit in and use foam to quieten the noise (on top and around the unit). Depending upon how long you have had it, it may also need a clean out or possibly even the motor bearings are getting a bit worn, creating some noise with the excess movement.
Good Luck
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