i have no problems with v47 except short outages (like the gaps between tracks) in music playback if i listen with a bh-905 bluetooth headset connected to the n900.

it seems to me that these playback outages do not happen so often if i'm not connected to a wlan network at the same time.

with v46 i haven't noticed any playback outages in conjunction with a bluetooth headset.

maybe this is related to the posts here and here.