First, let's just state that your systems are networked, but you are not sharing files or printers? Even so, Microsoft's networking, by design will look for other machines in the LAN (yes, you have one) to supply machine information such as what services are being offered and then put that in the Network Neighborhood display.
This browsing of the network is programmed to happen every so many minutes with one default (since its changable I can't tell you what yours is) being 45 minutes. That fits nicely into your 8 to 10 times a day.
As such, I don't think you have a big issue to fix or someone to trace.