Thanks for the suggestion Mitchelle. I thought I had done that but going through the routine again I realised that I had clicked to restore the previos setting. However, I just made it repair itself. Logging on did seem a bit quicker in the it only took 63 secs to log on to the network. I'm nor sure if this is normal.
I have BB through FOrce 9 , same company, and was having problems initially because I had forgotten to put a filter on one of the phone extensions. It also caused connectoin to drop out on a regular basis. Worth checking.