You might get a screen similar to the one below when using the BBC iPlayer. It can occur when you put a stream on hold and then come back to restart the stream, really annoying but there is a simple fix.
Navigate from the Home screen to,
SYSTEM : Settings : Add-ons : Enabled Add-ons : Video Add-ons : iPlayer
Select Configure
Navigate to Advanced tab
Select Force release resume lock
then this will pop up
Click OK and return home. Job done.