Nitro Magnum sensitive to bumps in base below thread inserts?

Hi,

As this is my first post in this newsgroup, I think it is a good idea to
introduce myself. As you might guess, I'm from The Netherlands, 32 (almost
33) years old and 1.93m/85kg (relevant for snowboarding). I snowboard for
4 years, partly indoor (www.snowworld.com and then Landgraaf, 500m indoor)
and in the real snow in Austria. Shortly, I took some lessons in skiing.
That goes quite well, but I'm not switching to skiing :-)

Last year, I bought a new Nitro Magnum 1.65m. Great board to ride with,
but some problems though.

One problem is that the base developed bumps just below the thread
inserts of the bindings. I did not over tighten the screws, but still I
got bumps that were a few mm deep. It even happened after a few hours
indoor when I changed the stance. I could clearly see spots where the
base is recessed just below the mounting points of the bindings.

So I went back to the shop. I have a good relation with the shop owner
and he informed at Nitro. After a few weeks, the answer came that they
did not accept responsibility for this problem.

I read through the archives of this group and read that some guys here
prefer Burton. I must say that my previous board (Burton Cruzer 164) had
no problems whatever. Also, the steel edges seemed to stay sharp longer
than with the Nitro. Is it general quality difference?

Bas.