Rhythmic knocking from rear

[uncle bob]

Love our MME, 12400 miles over the last 8 months. However, for most of that time there has intermittently been a knocking sound from the back. It is frustrating that it occurs only inconsistently, but can be loud and annoying when it happens - and clearly should not be happening. The dealer could not reproduce it when I took it in at 10K miles.
There can be a single loud knock when lifting off the accelerator (1 pedal drive) - best heard at the 10 second mark of this video. But when coasting - foot barely on the accelerator - a rhythmic knock, knock, knock happens, correlating with the speed of the car - best heard from 18 seconds on in this video. This also occurs at higher speeds, but is harder to hear because of higher road/wind noise.
Have an appt with dealer again in 11 days, but wondering if anyone else has experienced this?

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[Mrn]

I sometimes hear and feel a slight thump when starting to accelerate when the motor goes from holding the car back to pushing it forward. I've just considered it a normal result from gear and axle mechanical tolerances. I'm assuming it's normal?

 

[4sallypat]

I figured mine had that noise due to the stuff under the rear hatch cover....

 

[uncle bob]

It happens when I'm taking my foot OFF the accelerator.
Nothing is rolling around back there.
Turn up the volume to max and listen from 20 seconds on in the video.
We'll see what the dealer can come up with.

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