Download a free app called OpenSignal onto your netbook. Then you can run a check on your WiFi signal, Internet (data) connection, your ping, download, upload speed, router and so forth.
It's recommended by Which? and pretty intuitive.
So next time you have a problem like this you can go straight to this for a diagnosis.
Mine tells me that the download speeds I'm getting with BT Infinity is less than half what I was promised
July 23 Limerick (continuation of July 21)