Streaming TV randomly dropping out

This just started happening recently, all the programs I use for accessing live TV: Freely, Freeview are all now freezing for seconds/minutes at a time they usually restart without me doing anything but it is incredibly frustrating when it does happen you see once it starts it carries on and on it isn't the router as I've just had an engineer to come and look at that and there's no problem. So it must be a problem with the machine or a setting that isn't working right.
Does anyone know what could be causing it and if there is a fix for it.