Elektron Musical Instruments

Hi all, I'm new here. I bought a MD one month ago, and from time to 
time, whenever I press a button it reacts as if I had pressed it 
twice: this makes play go play, then pause; or makes a drum sound 
twice.

Its not a big deal as it happens every once in a while, but I'd like 
to know if anyone else as this problem. I'm a little scared of what 
could happen using it live.

Maybe its the button layer defective? could it be a software thing 
(dont think so)? What do you guys reccomend?

Also another question, why is the sid station so expensive? what 
makes it so special?

Anyways, thanks in advance