"Personally I wouldn't get an apple. It sounds more like not enough data getting to the dongle you need to remember their only small and stuck behind your TV. try moving your wifi closer or just getting a better reception by the TV."
"How are you connected to the network? Wirelessly or Ethernet cable. What do you call a strong signal? What's your network speed? Where are you measuring your signal from? What sort of connection have you got now?"