Fix your internet/wireless connection and/or change server?
Dropped frames and bitrate bouncing up and down both may be caused by unstable internet/wireless connection. Bitrate dropping to 100, then shooting up to 3000, might mean the poor connection could only send 2 frames a few seconds sometimes dropping frames, then 50 frames for a next second, even though it was set to 30 fps. Video players will buffer and play at the correct frame rate of 30 fps, but will show dropped frames as freezing video.
Show us your log file?