Anyone else experiencing something similar?
Over October and December I have been using Audiogalaxy to stream music from my PC to my phone during my (exceptionally long) commute. Yea its a bit data intensive, but I don't really care!
Anyway, ever since the turn of the new year, my streaming service has been skipping like a first generation CD player after around 4:00 in the afternoon (don't know when exactly it starts). The thing that leads me to believe this isn't just about network congestion, though, is that it happens whether I am way out of Tokyo in the inaka, or in central Tokyo. My download/upload speed remains decent (for Softbank anyway), and while it has considerable trouble streaming the music, doing other network activities like web browsing or playing online games are uninterrupted.
So it could be that Softbank has initiated a policy of throttling certain web services during peak hours. Perhaps people on your blog can confirm/deny this?