Limited functionality on a couple of new micro:bits

Hello everyone,

I’m having some trouble with using two new micro:bits I purchased from Pimoroni last month.
I currently own four of them and I commonly use micropython, but it seems that the music and the random module do not work in these particular devices. Namely, music produces no sound and random always gives out the same number (the lowest of any interval).

What I’ve tried so far:

  • flashed the latest firmware onto them
  • tested the modules through Mu’s REPL: other micro:bits respond fine to the commands, these ones don’t

Is there some extra step that we now have to take for micropython to work fully? Might this batch of micro:bits have some problem?

Thank you for your help.