Shudder with a clunk/thunk from the rear while in first or second gear

cx9-2012

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2012 CX-9 GT AWD
I am looking for some information on my 2012 CX-9 which has 7,000 miles on it. To provide some context, it had the symptoms of the widespread PTU (power transfer unit) problem, with oil leaking on the garage floor at around 6,000 miles. The dealer replaced the PTU under warranty. Since then, a new problem has started which manifests itself sometimes, not always. I hear a shudder with a clunk/thunk at the rear (underneath the car) when

1. The car starts and accelerates.
2. I release the gas pedal and then press back while still being in 1st or 2nd gear (e.g., if I need to slow down while going uphill or taking a turn just after starting) .

This seems to happen exactly when the power re-engages to the rear wheels (after dis-engaging when I released the gas pedal). This doesn't happen always but when it does, this is the symptom. The dealer is unable to diagnose the problem. Has somebody seen this problem? Any help would be much appreciated.
 
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