MB Pro has lost its airplay icon.

I have been having endless trouble with apple tv recently in the form of jerky video playback.
Today, no airplay icon on the Macbook!
I have restarted apple TV, Router, MBpro but all to no avail.
Nothing has been updated etc so it seems to have happened in its sleep...
Thank you in advance

Hi,
My mbpro has no ethernet port.
Apple TV is currently connected via HDMI to a samsung 'smart' tv and cable broadband at 50meg download and 3 meg upload.
I have a 5ghz and 4 ghz wireless connection. It jerks on both.
If I connect the mbpro to the apple tv direct via USB its brilliant.
However that really takes away the whole point of the apple TV really.

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