Doesn't seem to be a connection problem. Connection problems cache (buffer) the whole stream and pauses it, not just the video or the audio separately.
Sometimes the connection is just fine but other problems exist like the stream itself of very low quality that the encode originally dropped frames, you are viewing a very low bitrate stream, your computers is not powerful enough, your operating system is has issues, drivers, etc.
However, if you wanna make sure the connection is the problem, test your device (computer) on another connection.