My music collection is a rather big one. When playing all songs (Browse -> Browse Songs -> Play) the Soundbridge crashes and reboots when shuffeling all songs. Crashes and reboots also occur skipping to the next song (with all songs loaded into the memory).
I assume the playlist gets too big to be handled by the M2000. When I saw there was only 16Mb of memory available, I thought more memory could solve this issue. However, I might be wrong.
Just curious, what were you hoping to achieve with a memory upgrade? Are you getting an out of memory error?
Large digital music collection -> Netgear ReadyNAS & Firefly Media Server -> Roku Soundbridge M2000 -> Harman Kardon & Kef