Thanks for reporting the issue!
I just streamed PBS for 30 minutes on my laptop (in Chrome on MacBook) and didn't have any disruption. When Puffer is not out of service, typically your connection times out due to inactivity, e.g., the browser window that streams Puffer has been put in the background.
Could you please try watching Puffer in full screen and enable audio, and see if the issue persists? Make sure no other applications are placed on top of the Puffer screen and the laptop does not go to sleep or power saving mode.
Best,
Francis