Sonar issue

Hello I've never posted before as always ok with my product (latest download), however I've been having issues with my internet connection being delayed at startup by 2 or three minutes, I thought my router was giving problems (BT home hub 4) as the delay was also bringing an error message from Norton that sonar was not connected and to "fix" this being fixed when the router connects automatically. So in a sense Sonar is creating its own fault. I have done numerous restarts with sonar on and off and I don't seem to get the delay in connection with it off.

Has anyone else experienced this kind of issue, I am still investigating, as something may be making this happen, could it be a virus etc.

My setup is Asus p7x79 mobo, intel i7 3930k cpu 16gb ram, running Windows 7 pro 64bit