This you can look up in TWS. Go to menu Help -> Data Connections. It will show you the data farms where the price/volume data is coming from. The connection which is called "Primary" is the one for your main connection, where your account data comes from (e.g. account value, list of open positions) and where your order lines are being sent to.
I noticed that meanwhile nobody else has confirmed your observation about connectivity issues. That gives me an indication that you might be the only one who is observing this. People are generally rather outspoken on this forum, and if there were a problem with IB it would be mentioned widely here.
