Ok, here is a tip for people using wireless connection to your router/hub thingy (or whatever the technical term is)
Someone I know who is a computer whizzzz and I asked him about the problem, he checked it out for me. Here is what he done.

If you are using a wireless broadband conection, you have to get into the wireless channel settings of the router/hub thingy. Mine was set on channel 7. He said that is the wrong channel!?!? apparently you can use any of about 12 channels but channel 11 is what it should be set on and is the premium wireless channel.
So if you know how to change the wireless channels of your router, make sure it's on channel 11 to keep a premium connection to run PKR.

For an hour before he changed the channel I had the problems set out in the post above. Once he changed the channel it ran perfect with 3 tables running and a 9/10 - 10/10 constant connection.
Hope that's some help.