1) SkyTrak can only communicate over 2.4Ghz, so you can't use the 5Ghz network.
2) Have you tried running a speed test on your network? Just because it has good signal strength doesn't mean that it is fast. WGT is a browser-based game, so it needs a fast connection.
3) I assume your networks are 'under the c' and 'under the c_ext'? If so, that could mean your iPad is hopping back and forth between them while the SkyTrak remains connected only to one (ie you lose connection to the unit in the app)