Hi Harjo, I use NOD32 from more than 2 years now… what makes you think the disconnections are related with NOD32?
In NOD32 control cernter there are some activity reports; you can start from there…
You can also try to contact their support: http://www.nod32.nl/support
In Italy their support team works really well - a polite & competent technician usually answer your phone call before the third ringing !!!