yep, all the time. It's become even more relevant than sopcast since the latter started blocking streams for most european championships, including the CL (I think Serie A and La Liga are the only major leagues where games aren't being blocked yet). Sopcast is very susceptible to this as they have a centralized server (which is why it's so easy to load the stream and then have smooth playback in the first place). A torrent-based software like Acestream doesn't have this problem but might take 5-10 min till the stream stabilizes, so it may be a good idea to connect a little earlier.
when you instal acestream, make sure you UNCHECK the browser plug-in option (it's one of the options in the default instal settings) as those would end up displaying some russian porn adds or whatever as you browse later on