If a broadcast stutters or freezes and buffers, it is usually due to a poor or insufficient internet connection. The problem is that it can occur both where you are broadcasting from and where you are watching. Here are some tips that may help:
Lower the quality
If the broadcast goes out in several qualities, you can force a lower quality by selecting it under the gear wheel. If this helps, it's a bandwidth issue between you and Rackfish Live. Bandwidth issues are particularly common on mobile connections which, although very fast, can vary rapidly in performance.
Review network and internet connection
Check that you have a fast enough connection. With Bredbandskollen.se you can get an idea of how good a connection you have, as a rule of thumb you should have 5-10 Mbps to receive broadcasts in high quality. Which quality varies with how you send out streams, really high quality can be 10 or 20 Mbps or higher. Keep in mind that proper margins are needed. The broadcast needs its bandwidth, but if there are several people in an office watching the same broadcast, this multiplies - and that other use also consumes bandwidth.
Web browser
Make sure you have a fully updated browser. Feel free to try opening the movie in a different browser and see if it works better.