I can confirm that same bug exists in my N900 handset with PR 1.2.

With internet streams the media player just stops after while when screen is dimmed (power save). Media player it's not able to resume until the handset is resumed to "screen on" -state.

When the device is plugged to power, problem still persists.

I guess this is related to power save features of handset. Adjusting power save settings on 3g/Wifi APN settings does not help.

I'm sure this is not stream dependant, because it happens with all internet radio stations that are in media player.