corsimusic, a good incoming speed, although very low outgoing, but it should suffice (I have an outgoing stream for the RP about 24 KB/s)
In early June, I had a similar situation, when 2 days RP did not work normally. It was also a long buffering. But the mobile application on the Android tablet, too, could not normally play flac stream.
Then everything was restored by itself. I did not understand why it was, maybe the provider was to blame.