After a restart iTunes, Youtube, Vimeo, etc. all stream perfectly. After some period of time (I'm not sure if only after the Mac has slept?) iTunes streaming of audio and all video streaming (YouTube, Vimeo, HBO, etc.) all stop streaming. With video this happens with both Safari and Chrome. And all I get is the continuous circle suggesting buffering. I've not had them stop streaming while actually streaming, it's at some point after I stop streaming. I'm not sure if it only occurs after the Mac has gone to sleep. This doesn't happen on any other device on the network. I've tried all of the basic standard fixes. It's a 2012 iMac mini with the 2.6mhz i7 and 16gb of memory. I have pretty fast internet and streaming works flawlessly, when it works. It also works flawlessly on all other devices on the network. So I don't think it's a problem with internet connections. Anyone have any ideas?