Yah, I try to keep the clean setup in at least one device :

a) Clean n810 with latest firmware, Clean beta8 install, clean last.fm install
(my testing devices are others, they really don't count)

But I'm not saying that is your fault, just telling my experience, trying to actually find the problem also... because we need to be able to reproduce it to be able to solve it correctly

I'm playing again now (4 songs already) problems : as I'm using my internet connection heavily it hook up a few times the playback : / exactly when loading a compelx page / download. I will see how our buffering system is working.

Cheers
Marcelo