I have the same problem with a Motorola v3i. It used to work with OS 2005 (so it seems to me the problem is not with the phone). I filed a bug, and maemo have just said it 'can't be reproduced' but there are lots of similar reports re Motorola phones on this forum.
I suppose it might help if more people reported the problem to maemo:

https://maemo.org/bugzilla/show_bug.cgi?id=729