Navara D40 Clutch Problems and Speedo Accuracy

Hi all been reading the achived threads about the Navara D40 Clucth problems. In particiular the thread posted by macca172 thread no 44605 Apr 22, 2007.
I also own a D40 Navara now 12 months old, I have experienced since new the acrid smell of burning clutch intermittently after driving around town and I would like to think I'm a good driver and don't abuse my clutch. Now feeling better after reading these threads and other websites that it appears to be a more of a common problem not just mine.
I took it on the beach for the first time in April this year and experienced the acrid smell and some smoke from the clutch after it got stuck in the soft stuff after about 1min of back and forth motion trying to get out and only getting deeper when the smoke appeared I stopped to let it cool and eventually got going again with the help of a good samartian who snatched me out. For the next two days no clutch problems a bit of a smell nothing out of the ordinary in my prior experience. The third day the clutch started to slip. I decieded to turn around head back to camp to to ensure I could get off the beach the next day. Once I hit the black top I could not get out of 1st gear. Managed to get it to the local nissan dealer once stopped had to be pushed into the worshop. Where they could not fix it until tree days time so I had it towed back to my dealer in Brisbane where it was found to have failed (12000km on clock) and Nissan replaced under warranty. Still experiencing smell form new clutch and again when on the beach last week under no load in soft sand was getting smell again.

I also have an inaccuracy of 7-8km an hour on my speedo. So doing 93kph when reading 100km.

Would love to know if anybody has had Nissan offer a way to fix solve either of the above mentioned problems since the original thread was posted.