Sounds like the differential hitting the tool tray.
You may have to be quite forceful with the dealer - I learned the hard way that Morgan have quite fixed views on what constitutes a warranty issue on rear springs. I ended up changing mine to Mulfab 4 seater 4 leaf springs when the car was 3.5 years old. Much improved - hasn’t bottomed out once since.
Having put the above - I was under the impression that the factory had changed to a higher quality rear spring in the last 18 months or so.
