You seem to have two issues with what I am assuming are both brand new components. Firstly Vivaldi Transport opening and switching of its own accord and secondly Vivaldi DAC with USB issues.
These should be dealt with a.s.a.p .
dCS has a worldwide distributor and dealer network which are there in part to deal with issues . It may also be that the problems can be fixed locally without need to send it all of the way to the UK. I am assuming ( perhaps wrongly) that you are not in the UK. If I were you I would start by following the usual route for service especially as it is under guarantee and you will not want to personally incur shipping charges and deal with customs . I live in the UK and as a dCS customer of long standing was used to dealing directly for service issues. These days, however, it all passes via dealer and the UK distributor.
Where are you in the world as you have not divulged this in your profile? Please do add this information as it can be of help and prevents us advising things that may not be available to you.