I have this exact issue as well.

Windows 8.1 - Happens in all Browsers, my Firefox is updated to 25.0. - flash is the latest version as well.

Streams keeps reloading every few seconds, I’m lucky to be able to see 10 secs.

Looking at the taskbar in windows the avast logo is “turning” all the time, pretty sure it shouldn’t do that.

(also the captions here are really annoying)